bugzilla-data-low.json

{"bugs":[{"severity":"S3","summary":"Delayed image loading on low end ARM devices","last_change_time":"2023-02-22T21:45:14Z","status":"ASSIGNED","op_sys":"Android","component":"Performance","creation_time":"2019-01-23T21:52:44Z","keywords":["perf:pageload"],"id":1522282,"priority":"P1"},{"id":1631949,"keywords":["perf:startup"],"priority":"P3","summary":"Investigate merging shader cache files","severity":"S3","creation_time":"2020-04-21T20:52:29Z","op_sys":"Unspecified","component":"Graphics","status":"ASSIGNED","last_change_time":"2022-10-12T00:08:45Z"},{"creation_time":"2023-07-27T16:40:28Z","component":"JavaScript Engine","op_sys":"Unspecified","status":"ASSIGNED","last_change_time":"2024-12-12T23:01:08Z","summary":"Google blog page loads very slowly and often fails to fully load","severity":"S2","priority":"P3","id":1845775,"keywords":["webcompat:blocked","webcompat:platform-bug","webcompat:site-report"]},{"priority":"P3","id":486378,"keywords":["blocked-ux","perf"],"component":"Bookmarks & History","op_sys":"Windows Vista","creation_time":"2009-04-01T20:00:41Z","last_change_time":"2023-05-16T02:23:47Z","status":"NEW","summary":"Poor performance using bookmarks menu with large amounts of bookmarks.","severity":"S3"},{"last_change_time":"2024-03-22T08:26:57Z","status":"NEW","component":"Places","op_sys":"All","creation_time":"2009-04-29T22:35:30Z","severity":"N/A","summary":"[meta] Implement an Asynchronous API for opening container query nodes","priority":"P3","keywords":["main-thread-io","meta","perf","perf:frontend","perf:responsiveness"],"id":490714},{"priority":"--","keywords":["perf","perf:responsiveness","testcase"],"id":575614,"last_change_time":"2022-10-10T22:59:55Z","status":"NEW","component":"Layout: Columns","op_sys":"All","creation_time":"2010-06-29T14:36:04Z","severity":"S3","summary":"{inc} Resizing window is slow for long list with multicol (from \"-moz-column-count: 3\" or \"column-width: 20em;\")"},{"severity":"S3","summary":"Very slow chrome to content DOM access","status":"NEW","last_change_time":"2024-12-09T16:19:44Z","creation_time":"2010-11-19T15:34:28Z","op_sys":"macOS","component":"XPConnect","keywords":["perf","perf:pageload"],"id":613498,"priority":"--"},{"priority":"P3","keywords":["perf","perf:resource-use"],"id":646937,"status":"NEW","last_change_time":"2022-10-10T23:24:13Z","creation_time":"2011-03-31T18:37:55Z","component":"Widget","op_sys":"Linux","severity":"S3","summary":"throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)"},{"severity":"S3","summary":"Repeated calls to location.hash = \"#foo\" cause large amounts of disk activity","status":"NEW","last_change_time":"2023-12-04T16:12:25Z","creation_time":"2011-06-02T18:09:59Z","component":"Places","op_sys":"All","keywords":["perf","perf:responsiveness"],"id":661590,"priority":"P3"},{"keywords":["perf","perf:resource-use"],"id":711924,"priority":"--","severity":"S3","summary":"Compositing/present still hapens when the only changing parts are out of the viewport","last_change_time":"2024-04-08T16:58:41Z","status":"NEW","component":"Graphics: WebRender","op_sys":"All","creation_time":"2011-12-19T09:05:20Z"},{"keywords":["perf"],"id":760888,"priority":"--","severity":"S3","summary":"IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow","last_change_time":"2024-04-05T11:37:58Z","status":"NEW","component":"Graphics: Canvas2D","op_sys":"All","creation_time":"2012-06-03T03:18:54Z"},{"keywords":["perf:resource-use"],"id":803709,"priority":"P3","severity":"S3","summary":"We appear to be copying large data URIs over and over in nsSimpleURI.","status":"NEW","last_change_time":"2023-06-05T16:31:57Z","creation_time":"2012-10-19T21:25:22Z","op_sys":"All","component":"Networking"},{"priority":"P3","keywords":["perf:responsiveness"],"id":810214,"last_change_time":"2023-06-23T03:10:06Z","status":"NEW","component":"PDF Viewer","op_sys":"Linux","creation_time":"2012-11-09T08:29:30Z","severity":"S3","summary":"Processing http://lib.tkk.fi/Dipl/2002/urn007413.pdf is slow, and its text layer is all messed up"},{"op_sys":"Windows 7","component":"CSS Parsing and Computation","creation_time":"2012-12-14T13:46:12Z","last_change_time":"2023-03-01T12:04:23Z","status":"NEW","summary":"janky Scrolling on smartsheet.com Sheets","severity":"S3","priority":"--","id":821693,"keywords":["perf","perf:responsiveness"]},{"summary":"nsIconChannel::AsyncOpen can block","severity":"S3","op_sys":"Windows 7","component":"Graphics: ImageLib","creation_time":"2013-01-07T19:06:03Z","last_change_time":"2022-11-24T06:34:31Z","status":"NEW","id":827440,"keywords":["perf"],"priority":"--"},{"keywords":["perf"],"id":827937,"priority":"--","severity":"S3","summary":"Opening huge mercurial long commit page freezing Firefox","last_change_time":"2022-10-29T12:12:42Z","status":"NEW","op_sys":"Windows 8","component":"Layout","creation_time":"2013-01-08T19:17:33Z"},{"creation_time":"2013-01-14T22:07:19Z","op_sys":"All","component":"SQLite and Embedded Database Bindings","status":"NEW","last_change_time":"2024-08-20T19:28:43Z","summary":"Firefox should abort on tryserver when executing SQL on the main thread","severity":"S3","priority":"P3","id":830504,"keywords":["perf:frontend","perf:responsiveness"]},{"op_sys":"All","component":"General","creation_time":"2013-02-05T02:16:08Z","last_change_time":"2023-05-16T02:22:53Z","status":"NEW","summary":"Use IOUtils for gLastOpenDirectory","severity":"S3","priority":"--","id":837989,"keywords":["main-thread-io","perf:frontend"]},{"severity":"S3","summary":"nsFileChannel::nsFileChannel causes expensive lstats","status":"NEW","last_change_time":"2024-03-27T16:10:09Z","creation_time":"2013-04-16T15:29:21Z","component":"Networking: File","op_sys":"macOS","keywords":["main-thread-io","perf:responsiveness"],"id":862383,"priority":"P3"},{"priority":"P3","keywords":["main-thread-io","perf","perf:frontend"],"id":890712,"status":"NEW","last_change_time":"2024-04-01T16:26:36Z","creation_time":"2013-07-07T15:57:11Z","component":"Networking","op_sys":"All","severity":"S3","summary":"nsIOService::NewFileURI is doing main thread IO and causes jank"},{"severity":"S3","summary":"Polygon.com page scrolling becomes extremely slow after a while","status":"NEW","last_change_time":"2023-07-27T07:06:57Z","creation_time":"2013-09-10T12:49:00Z","component":"Layout","op_sys":"All","keywords":["perf"],"id":914595,"priority":"--"},{"summary":"Visibility state is not updated when the browser window is obscured or on another workspace","severity":"S3","creation_time":"2013-09-17T02:34:03Z","op_sys":"All","component":"General","status":"NEW","last_change_time":"2022-10-11T01:07:35Z","id":917090,"keywords":["perf:resource-use"],"priority":"--"},{"summary":"Optimize GetRootPresContext() to avoid going through the viewmanager / view tree","severity":"S3","creation_time":"2014-03-18T00:14:52Z","component":"Layout","op_sys":"Linux","status":"NEW","last_change_time":"2022-10-24T12:16:02Z","id":984690,"keywords":["perf"],"priority":"--"},{"keywords":["perf:frontend"],"id":1023152,"priority":"--","severity":"S3","summary":"Preload panel contents on hover of toolbar button","status":"NEW","last_change_time":"2023-07-19T04:52:40Z","creation_time":"2014-06-10T10:02:00Z","component":"Toolbars and Customization","op_sys":"All"},{"priority":"P3","keywords":["perf:frontend"],"id":1047817,"status":"NEW","last_change_time":"2023-05-11T18:04:55Z","creation_time":"2014-08-02T09:50:40Z","op_sys":"All","component":"Places","severity":"S3","summary":"Make bookmarks toolbar view use async openContainer"},{"severity":"S3","summary":"Poor performance in Ember app Discourse","last_change_time":"2022-10-11T15:57:30Z","status":"NEW","component":"JavaScript Engine","op_sys":"Android","creation_time":"2014-11-12T00:22:19Z","keywords":["perf"],"id":1097376,"priority":"--"},{"summary":"[e10s] There is a delay for about 1 seconds to display <select> drop-down list with 1600+ items","severity":"S3","op_sys":"All","component":"Layout: Form Controls","creation_time":"2015-01-06T01:55:10Z","last_change_time":"2024-09-23T19:34:25Z","status":"NEW","id":1118086,"keywords":["multiprocess","perf","perf:responsiveness","testcase"],"priority":"P5"},{"status":"NEW","last_change_time":"2023-10-11T11:00:04Z","creation_time":"2015-04-15T23:32:29Z","op_sys":"Windows 8.1","component":"JavaScript Engine","severity":"S3","summary":"[Meta] Move JS parsing off of main thread and enable incremental parsing","priority":"--","keywords":["meta","perf"],"id":1154987},{"summary":"Very laggy panning and zooming of map on Orbis website","severity":"S3","creation_time":"2015-04-16T18:22:07Z","component":"Graphics: WebRender","op_sys":"All","status":"NEW","last_change_time":"2024-04-02T23:00:44Z","id":1155307,"keywords":["perf:animation","perf:responsiveness","reproducible"],"priority":"--"},{"component":"JavaScript: GC","op_sys":"Unspecified","creation_time":"2015-05-07T18:46:57Z","last_change_time":"2023-08-29T16:48:48Z","status":"NEW","summary":"ES6 Map performance for large numbers of elements is deficient","severity":"S3","priority":"--","id":1162665,"keywords":[]},{"last_change_time":"2023-02-19T05:13:03Z","status":"NEW","op_sys":"Unspecified","component":"DOM: Animation","creation_time":"2015-10-10T00:31:34Z","severity":"S3","summary":"2D canvas+HTML/CSS animation demo site broken on Firefox, works great on Chrome","priority":"--","keywords":["perf:responsiveness"],"id":1213513},{"keywords":[],"id":1217748,"priority":"--","severity":"S3","summary":"On/Off opacity changes shouldn't create active layers","last_change_time":"2024-09-22T12:08:26Z","status":"NEW","component":"Layout","op_sys":"All","creation_time":"2015-10-23T09:20:20Z"},{"severity":"S3","summary":"Block JavaScript parser thread when source code characters are not available","last_change_time":"2022-10-11T17:46:56Z","status":"NEW","component":"JavaScript Engine","op_sys":"Unspecified","creation_time":"2015-11-05T17:44:28Z","keywords":["perf"],"id":1222086,"priority":"--"},{"summary":"Low performance of texImage2D with canvas2d and WebGL","severity":"S3","op_sys":"Unspecified","component":"Graphics: CanvasWebGL","creation_time":"2016-02-06T17:43:25Z","last_change_time":"2024-05-17T08:40:26Z","status":"NEW","id":1246410,"keywords":["perf","regression","testcase"],"priority":"P3"},{"id":1257910,"keywords":["perf:responsiveness","reproducible"],"priority":"--","summary":"Firefox hangs with 100% CPU usage when scrolling on specific page","severity":"S3","component":"Graphics: WebRender","op_sys":"Unspecified","creation_time":"2016-03-18T17:34:07Z","last_change_time":"2024-09-22T11:59:59Z","status":"NEW"},{"priority":"--","id":1265980,"keywords":["perf"],"creation_time":"2016-04-20T07:12:37Z","op_sys":"Unspecified","component":"JavaScript Engine","status":"NEW","last_change_time":"2022-10-11T18:13:31Z","summary":"Running jasmine is slower than Safari and Chrome","severity":"S3"},{"priority":"--","keywords":["perf"],"id":1278554,"status":"NEW","last_change_time":"2022-11-08T00:01:53Z","creation_time":"2016-06-07T13:45:20Z","op_sys":"Unspecified","component":"Graphics: Canvas2D","severity":"S3","summary":"CanvasRenderingContext2D::DrawImage takes lots of  time when scrolling Google Spreadsheet"},{"summary":"Angular framework performance test spends 10% in nursery GC","severity":"S3","op_sys":"Unspecified","component":"JavaScript: GC","creation_time":"2016-06-19T13:43:03Z","last_change_time":"2024-08-11T09:37:57Z","status":"NEW","id":1280802,"keywords":["perf"],"priority":"P3"},{"priority":"P3","id":1283089,"keywords":["perf:responsiveness","regression"],"op_sys":"Linux","component":"Graphics","creation_time":"2016-06-29T13:06:59Z","last_change_time":"2022-12-08T15:45:06Z","status":"NEW","summary":"Firefox 40+ are very sluggish through x2go","severity":"S3"},{"severity":"S3","summary":"Try to tick refresh driver during html parsing","last_change_time":"2022-10-11T18:30:52Z","status":"NEW","op_sys":"Unspecified","component":"Layout","creation_time":"2016-08-12T05:51:58Z","keywords":["perf"],"id":1294625,"priority":"P3"},{"id":1296161,"keywords":["perf"],"priority":"P3","summary":"Measure and solve sync reflow for studying gdoc performance.","severity":"S3","component":"Layout","op_sys":"Unspecified","creation_time":"2016-08-18T03:04:45Z","last_change_time":"2022-10-11T18:31:41Z","status":"NEW"},{"severity":"S3","summary":"Implement Expected Queueing Time (EQT) for Telemetry/Profiler","last_change_time":"2022-10-11T18:35:56Z","status":"NEW","component":"DOM: Events","op_sys":"All","creation_time":"2016-09-16T09:55:31Z","keywords":["perf"],"id":1303296,"priority":"P3"},{"keywords":["perf"],"id":1307024,"priority":"--","severity":"S3","summary":"[Perf] [google docs] Firefox will get 3~9% faster when running gdoc test cases with chrome user agent","last_change_time":"2024-08-14T04:57:13Z","status":"NEW","op_sys":"Linux","component":"General","creation_time":"2016-10-03T03:00:35Z"},{"severity":"--","summary":"for background tabs, break refresh driver tick into multiple events off the main thread's event loop","last_change_time":"2022-11-02T13:08:23Z","status":"NEW","component":"Layout","op_sys":"Unspecified","creation_time":"2016-10-08T00:18:22Z","keywords":["perf","perf:responsiveness"],"id":1308660,"priority":"--"},{"keywords":["perf"],"id":1316864,"priority":"P5","severity":"S3","summary":"Google Apps extremely slow -- scrolling, updating text, etc -- unusable","last_change_time":"2022-10-11T18:44:06Z","status":"NEW","op_sys":"Windows 10","component":"JavaScript Engine","creation_time":"2016-11-11T14:41:11Z"},{"priority":"P5","id":1320534,"keywords":["hang","meta","nightly-community","perf:frontend"],"op_sys":"All","component":"Bookmarks & History","creation_time":"2016-11-27T11:13:21Z","last_change_time":"2023-05-11T18:07:57Z","status":"NEW","summary":"[meta] Speed and performance of importing bookmarks from JSON or HTML files is awful","severity":"--"},{"summary":"DisplayList building shows signs of poor CPU usage","severity":"S3","op_sys":"Unspecified","component":"Layout","creation_time":"2017-01-11T03:23:20Z","last_change_time":"2023-02-07T15:18:45Z","status":"NEW","id":1330187,"keywords":["perf:resource-use"],"priority":"P3"},{"summary":"Explore using the presshell arena for FramePropertyTable","severity":"S3","component":"Layout","op_sys":"Unspecified","creation_time":"2017-01-12T08:37:41Z","last_change_time":"2022-10-11T18:55:13Z","status":"NEW","id":1330558,"keywords":["perf:resource-use"],"priority":"P3"},{"last_change_time":"2022-10-11T18:58:09Z","status":"NEW","op_sys":"Unspecified","component":"Graphics: Layers","creation_time":"2017-01-27T21:15:19Z","severity":"S3","summary":"PCompositorBridge::Msg_WillClose can block the UI thread when closing a window","priority":"P3","keywords":["hang","perf"],"id":1334655},{"creation_time":"2017-02-22T22:05:51Z","component":"Graphics","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:02:26Z","summary":"Slow performance at drawing rectangles on Google Slides","severity":"S3","priority":"P3","id":1341882,"keywords":["perf"]},{"priority":"P3","keywords":["perf"],"id":1341913,"last_change_time":"2023-08-18T02:30:51Z","status":"NEW","op_sys":"Unspecified","component":"Graphics","creation_time":"2017-02-22T23:15:05Z","severity":"S3","summary":"Stop looking up GLContext symbols for every new window"},{"priority":"P3","keywords":["perf"],"id":1342632,"last_change_time":"2022-03-02T15:55:52Z","status":"NEW","op_sys":"Unspecified","component":"Networking: HTTP","creation_time":"2017-02-25T04:45:01Z","severity":"S3","summary":"Speed up PHttpChannelConstructor and consider streaming HttpChannelOpenArgs"},{"op_sys":"Unspecified","component":"Graphics: Layers","creation_time":"2017-02-28T23:07:56Z","last_change_time":"2022-10-11T19:03:23Z","status":"NEW","summary":"nsIDOMWindowUtils::StartFrameTimeRecording should not use sync IPC","severity":"S3","priority":"P3","id":1343383,"keywords":["perf"]},{"summary":"Overpainting on Google docs","severity":"S3","component":"Web Painting","op_sys":"Unspecified","creation_time":"2017-03-01T15:26:14Z","last_change_time":"2024-11-22T02:22:00Z","status":"NEW","id":1343538,"keywords":["perf","perf:responsiveness"],"priority":"--"},{"summary":"Consider compiling Ion IC code less eagerly","severity":"S3","component":"JavaScript Engine: JIT","op_sys":"All","creation_time":"2017-03-10T12:17:59Z","last_change_time":"2022-10-11T19:05:12Z","status":"NEW","id":1346178,"keywords":["perf"],"priority":"P2"},{"component":"WebVR","op_sys":"Unspecified","creation_time":"2017-03-13T20:32:12Z","last_change_time":"2022-10-11T19:05:40Z","status":"NEW","summary":"Replace PVRManager::GetSensorState with lock-free shared memory structure (Eliminating message queue IPC)","severity":"S3","priority":"--","id":1346927,"keywords":["perf"]},{"priority":"P5","keywords":["perf"],"id":1347861,"last_change_time":"2022-10-11T19:06:12Z","status":"NEW","op_sys":"Unspecified","component":"JavaScript Engine","creation_time":"2017-03-16T09:28:24Z","severity":"S3","summary":"Consider storing hints during syntax parse"},{"priority":"--","keywords":["perf"],"id":1348697,"last_change_time":"2023-11-27T10:28:31Z","status":"NEW","component":"Layout","op_sys":"All","creation_time":"2017-03-19T22:26:30Z","severity":"S3","summary":"Optimize away OverflowAreasProperty more often"},{"severity":"S3","summary":"Improve performance of megamorphic stubs","status":"NEW","last_change_time":"2024-04-24T02:40:50Z","creation_time":"2017-03-21T09:28:43Z","component":"JavaScript Engine: JIT","op_sys":"All","keywords":["perf"],"id":1349148,"priority":"P3"},{"keywords":["perf"],"id":1350367,"priority":"P3","severity":"S3","summary":"Make service worker ScriptLoader paths use cached js bytecode from cache API","status":"NEW","last_change_time":"2022-10-11T19:08:05Z","creation_time":"2017-03-24T15:40:46Z","component":"DOM: Service Workers","op_sys":"Unspecified"},{"severity":"S3","summary":"Avoid full session history collect for DOMTitleChanged/OnHistoryReload","status":"NEW","last_change_time":"2023-07-19T04:57:18Z","creation_time":"2017-03-25T15:19:03Z","op_sys":"Unspecified","component":"Session Restore","keywords":["perf:frontend"],"id":1350569,"priority":"--"},{"keywords":["perf"],"id":1350618,"priority":"P3","severity":"S3","summary":"Bad performance on Sony Horizon game page","last_change_time":"2022-10-11T19:08:17Z","status":"NEW","op_sys":"Unspecified","component":"Audio/Video: Playback","creation_time":"2017-03-25T21:49:47Z"},{"creation_time":"2017-03-26T21:54:08Z","op_sys":"Unspecified","component":"General","status":"NEW","last_change_time":"2022-10-11T19:08:21Z","summary":"Add some instrumentation to find commonly added preference observers","severity":"S3","priority":"--","id":1350749,"keywords":["perf"]},{"id":1351755,"keywords":["nightly-community","perf","perf:resource-use","power"],"priority":"--","summary":"Provide \"Slight/Light/Low power/Battery saving/Battery saver\" mode option","severity":"--","component":"Performance","op_sys":"All","creation_time":"2017-03-29T17:44:37Z","last_change_time":"2023-06-26T13:30:14Z","status":"NEW"},{"status":"NEW","last_change_time":"2024-12-05T16:28:47Z","creation_time":"2017-03-29T18:30:44Z","component":"JavaScript: GC","op_sys":"Unspecified","severity":"S3","summary":"Add Telemetry probes for measuring garbage volume per GC","priority":"P3","keywords":["perf"],"id":1351789},{"keywords":["perf"],"id":1351829,"priority":"--","severity":"S3","summary":"Consider faster alternatives to PLDHashTable in hot Layout code paths","status":"NEW","last_change_time":"2022-10-11T19:09:06Z","creation_time":"2017-03-29T20:02:58Z","component":"Layout","op_sys":"All"},{"severity":"S3","summary":"Consider adding StyleDisplay() values to nsIFrame","last_change_time":"2022-10-11T19:09:06Z","status":"NEW","op_sys":"All","component":"Layout","creation_time":"2017-03-29T20:09:00Z","keywords":["perf"],"id":1351830,"priority":"--"},{"summary":"Avoid running the refresh driver when the page is in background","severity":"--","op_sys":"Unspecified","component":"Layout","creation_time":"2017-03-30T20:21:31Z","last_change_time":"2022-11-02T13:08:34Z","status":"NEW","id":1352205,"keywords":["perf","perf:resource-use"],"priority":"P2"},{"summary":"[meta] Improve GC scheduling","severity":"S3","creation_time":"2017-03-31T19:02:50Z","op_sys":"Unspecified","component":"JavaScript: GC","status":"NEW","last_change_time":"2023-05-05T15:21:18Z","id":1352524,"keywords":["meta","perf"],"priority":"P3"},{"priority":"P3","id":1353384,"keywords":["perf"],"creation_time":"2017-04-04T14:54:51Z","op_sys":"All","component":"JavaScript Engine: JIT","status":"NEW","last_change_time":"2022-10-11T19:10:17Z","summary":"Optimize GetName TypeOfNoProperty","severity":"S3"},{"creation_time":"2017-04-09T22:09:43Z","component":"XPConnect","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:11:14Z","summary":"Initialize sandbox global properties lazily","severity":"S3","priority":"P3","id":1354945,"keywords":["perf"]},{"last_change_time":"2023-07-19T04:59:14Z","status":"NEW","op_sys":"Unspecified","component":"Tabbed Browser","creation_time":"2017-04-11T13:02:53Z","severity":"S3","summary":"Investigate preparing the next tab on mousedown on the tab close button","priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1355456},{"id":1355459,"keywords":["perf:frontend"],"priority":"P4","summary":"The last window and the task bar item should disappear immediately on shutdown","severity":"S3","op_sys":"Unspecified","component":"General","creation_time":"2017-04-11T13:07:05Z","last_change_time":"2023-05-16T02:22:12Z","status":"NEW"},{"severity":"S3","summary":"Activating the browser window is janky","last_change_time":"2022-10-11T19:11:35Z","status":"NEW","op_sys":"macOS","component":"Widget: Cocoa","creation_time":"2017-04-11T13:26:24Z","keywords":["perf","perf:responsiveness"],"id":1355466,"priority":"P3"},{"priority":"P3","keywords":["perf:frontend","perf:responsiveness"],"id":1356532,"last_change_time":"2024-03-22T08:25:52Z","status":"NEW","op_sys":"Unspecified","component":"Autocomplete","creation_time":"2017-04-14T09:29:21Z","severity":"S3","summary":"Try avoiding layout flushes in autocomplete::_handleOverflow"},{"id":1356594,"keywords":["perf:resource-use"],"priority":"P3","summary":"Rewrite AppConstants.jsm in C++","severity":"S3","component":"General","op_sys":"Unspecified","creation_time":"2017-04-14T16:14:15Z","last_change_time":"2022-10-11T19:12:20Z","status":"NEW"},{"keywords":["perf","perf:frontend","perf:responsiveness"],"id":1357710,"priority":"P3","severity":"S3","summary":"Uninitializing UITour is expensive","last_change_time":"2024-03-22T13:34:58Z","status":"NEW","component":"Tours","op_sys":"Unspecified","creation_time":"2017-04-19T11:50:56Z"},{"id":1357810,"keywords":["perf","perf:responsiveness","triage-deferred"],"priority":"P3","summary":"Investigate source of memory_pressure event in gecko, and whether to repurpose it","severity":"S3","creation_time":"2017-04-19T16:33:44Z","op_sys":"Unspecified","component":"JavaScript: GC","status":"NEW","last_change_time":"2022-10-11T19:13:04Z"},{"priority":"P3","keywords":["perf"],"id":1357884,"last_change_time":"2023-03-27T17:08:05Z","status":"NEW","op_sys":"Unspecified","component":"JavaScript Engine: JIT","creation_time":"2017-04-19T20:51:47Z","severity":"S3","summary":"Pre-generate and cache the most common optimized Baseline IC stubs"},{"keywords":["perf","perf:frontend","perf:responsiveness"],"id":1358390,"priority":"P4","severity":"S3","summary":"1.24ms uninterruptible reflow at useLandscapeMode@chrome://devtools/content/inspector/inspector.js:460:27","last_change_time":"2023-03-15T12:20:36Z","status":"NEW","op_sys":"Unspecified","component":"Inspector","creation_time":"2017-04-21T07:04:16Z"},{"creation_time":"2017-04-21T07:44:25Z","op_sys":"Unspecified","component":"Menus","status":"NEW","last_change_time":"2023-07-19T05:12:10Z","summary":"13.97ms uninterruptible reflow at getComputedURL@chrome://browser/content/nsContextMenu.js:979:15","severity":"S3","priority":"P4","id":1358405,"keywords":["perf","perf:frontend"]},{"priority":"P4","id":1358730,"keywords":["perf"],"creation_time":"2017-04-22T08:02:21Z","op_sys":"Unspecified","component":"Tabbed Browser","status":"NEW","last_change_time":"2022-10-11T19:13:38Z","summary":"2.41ms uninterruptible reflow at stop@chrome://global/content/bindings/browser.xml:99:13","severity":"S3"},{"severity":"S3","summary":"0.93ms uninterruptible reflow at showNavToolbox@chrome://browser/content/browser-fullScreenAndPointerLock.js:576:18","last_change_time":"2023-03-15T12:22:15Z","status":"NEW","component":"Toolbars and Customization","op_sys":"Unspecified","creation_time":"2017-04-22T08:20:27Z","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1358734,"priority":"P4"},{"severity":"S3","summary":"0.91ms uninterruptible reflow at create@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/client/framework/toolbox-hosts.js:86:5","last_change_time":"2022-10-11T19:13:41Z","status":"NEW","op_sys":"Unspecified","component":"General","creation_time":"2017-04-22T20:35:28Z","keywords":["perf"],"id":1358810,"priority":"P4"},{"summary":"0.92ms uninterruptible reflow at _animateTabMove@chrome://browser/content/tabbrowser.xml:6165:26","severity":"S3","component":"Tabbed Browser","op_sys":"Unspecified","creation_time":"2017-04-22T21:09:20Z","last_change_time":"2023-07-19T05:14:35Z","status":"NEW","id":1358816,"keywords":["perf","perf:frontend","stale-bug"],"priority":"P3"},{"summary":"0.92ms uninterruptible reflow at PopupNotifications_showPanel@resource://gre/modules/PopupNotifications.jsm:932:9","severity":"S3","creation_time":"2017-04-24T23:00:04Z","component":"PopupNotifications and Notification Bars","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-04-25T08:29:24Z","id":1359259,"keywords":["perf","perf:frontend","perf:responsiveness"],"priority":"P4"},{"component":"Layout: Form Controls","op_sys":"Unspecified","creation_time":"2017-04-24T23:17:55Z","last_change_time":"2023-03-15T12:23:43Z","status":"NEW","summary":"2.17ms uninterruptible reflow at receiveMessage@resource://gre/modules/SelectParentHelper.jsm:214:7","severity":"S3","priority":"P4","id":1359263,"keywords":["perf","perf:frontend","perf:responsiveness"]},{"priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1359408,"status":"NEW","last_change_time":"2023-07-19T05:16:14Z","creation_time":"2017-04-25T13:40:22Z","component":"Frontend","op_sys":"Unspecified","severity":"S3","summary":"0.29ms uninterruptible reflow at _handleDOMChange@chrome://extensions/content/ext-browser-content.js:215:24"},{"priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1361635,"status":"NEW","last_change_time":"2023-07-19T05:17:38Z","creation_time":"2017-05-03T06:10:08Z","component":"DOM: Core & HTML","op_sys":"Unspecified","severity":"S3","summary":"1.19ms uninterruptible reflow from window.innerWidth at getContentSize@resource://gre/modules/PageThumbUtils.jsm:112:9"},{"severity":"S3","summary":"0.97ms uninterruptible reflow at @chrome://browser/content/tab-content.js:85:43","status":"NEW","last_change_time":"2024-04-03T03:05:43Z","creation_time":"2017-05-05T19:49:58Z","op_sys":"Unspecified","component":"Tabbed Browser","keywords":["perf","perf:frontend"],"id":1362529,"priority":"P4"},{"priority":"P3","id":1362533,"keywords":["perf"],"creation_time":"2017-05-05T19:55:47Z","op_sys":"Unspecified","component":"Bookmarks & History","status":"NEW","last_change_time":"2023-04-03T15:54:01Z","summary":"1.0ms uninterruptible reflow at PT__onDragOver@chrome://browser/content/places/browserPlacesViews.js:1600:11","severity":"S3"},{"id":1363354,"keywords":["meta","perf"],"priority":"--","summary":"[meta] YouTube first video play is slow","severity":"S3","creation_time":"2017-05-09T12:57:23Z","component":"General","op_sys":"Windows 10","status":"NEW","last_change_time":"2023-10-31T03:03:14Z"},{"keywords":["perf"],"id":1363403,"priority":"P3","severity":"S3","summary":"Facebook profile navigation start: access the user photo profile from a post","status":"NEW","last_change_time":"2022-10-11T19:16:52Z","creation_time":"2017-05-09T14:58:20Z","component":"JavaScript Engine","op_sys":"Windows 10"},{"op_sys":"Unspecified","component":"Toolbars and Customization","creation_time":"2017-05-12T03:27:15Z","last_change_time":"2023-03-15T12:35:29Z","status":"NEW","summary":"1.89ms uninterruptible reflow at insertPlaceholder@resource://app/modules/DragPositionManager.jsm:181:7","severity":"S3","priority":"P4","id":1364290,"keywords":["perf","perf:frontend"]},{"id":1364324,"keywords":["perf","perf:frontend"],"priority":"P4","summary":"0.98ms uninterruptible reflow at AreaPositionManager@resource://app/modules/DragPositionManager.jsm:24:23","severity":"S3","op_sys":"Unspecified","component":"Toolbars and Customization","creation_time":"2017-05-12T06:07:30Z","last_change_time":"2023-07-19T05:19:37Z","status":"NEW"},{"summary":"Setting innerHTML slower than in Safari","severity":"S3","component":"DOM: Core & HTML","op_sys":"All","creation_time":"2017-05-15T11:15:05Z","last_change_time":"2022-10-11T19:17:54Z","status":"NEW","id":1364861,"keywords":["perf"],"priority":"P3"},{"priority":"P5","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1365305,"last_change_time":"2024-03-22T08:08:02Z","status":"NEW","op_sys":"Unspecified","component":"Tabbed Browser","creation_time":"2017-05-16T16:23:18Z","severity":"S3","summary":"0.86ms uninterruptible reflow at _positionPinnedTabs@chrome://browser/content/tabbrowser.xml:6147:33"},{"status":"NEW","last_change_time":"2023-02-15T13:39:49Z","creation_time":"2017-05-18T04:36:30Z","component":"JavaScript Engine","op_sys":"Unspecified","severity":"S3","summary":"Lots of time spent in createScriptForLazilyInterpretedFunction() when playing a youtube video","priority":"P5","keywords":["perf"],"id":1365835},{"keywords":["perf"],"id":1367352,"priority":"P3","severity":"S3","summary":"[Input Latency] Firefox is 63% (35 ms) slower than Chrome in case Facebook - click right arrow on photo viewer","last_change_time":"2022-10-11T19:19:28Z","status":"NEW","op_sys":"Unspecified","component":"Graphics","creation_time":"2017-05-24T10:07:36Z"},{"priority":"P4","keywords":["perf"],"id":1368761,"last_change_time":"2022-10-11T19:20:24Z","status":"NEW","component":"JavaScript: GC","op_sys":"Unspecified","creation_time":"2017-05-30T16:58:29Z","severity":"S3","summary":"Investigate sweeping atoms table concurrently"},{"keywords":["perf"],"id":1370181,"priority":"P3","severity":"S3","summary":"Don't start possibly-long-running GC work when there's not much time left in the budget","status":"NEW","last_change_time":"2022-10-11T19:21:09Z","creation_time":"2017-06-05T09:45:53Z","component":"JavaScript: GC","op_sys":"Unspecified"},{"keywords":["perf:startup"],"id":1370658,"priority":"P3","severity":"S3","summary":"Components.manager.addBootstrappedManifestLocation() can do main thread IO at startup","last_change_time":"2023-05-31T19:42:07Z","status":"NEW","component":"Add-ons Manager","op_sys":"Unspecified","creation_time":"2017-06-06T20:27:46Z"},{"summary":"Amazon access book result navigation profile","severity":"S3","creation_time":"2017-06-09T13:21:26Z","op_sys":"Windows 10","component":"Layout","status":"NEW","last_change_time":"2022-10-11T19:22:19Z","id":1371646,"keywords":["perf"],"priority":"P3"},{"priority":"P3","keywords":["perf"],"id":1371661,"status":"NEW","last_change_time":"2022-10-11T19:22:22Z","creation_time":"2017-06-09T14:05:55Z","op_sys":"Windows 10","component":"JavaScript: GC","severity":"S3","summary":"Google image search profile"},{"id":1373694,"keywords":["perf"],"priority":"P3","summary":"Don't block on beforeunload events from third-party tracking domain scripts","severity":"S3","creation_time":"2017-06-16T15:07:57Z","op_sys":"Unspecified","component":"DOM: Events","status":"NEW","last_change_time":"2022-10-11T19:24:13Z"},{"severity":"S3","summary":"PCompositorBridge::Msg_NotifyChildCreated sync IPC when opening tabs","last_change_time":"2024-09-22T12:02:07Z","status":"NEW","component":"Graphics: Layers","op_sys":"All","creation_time":"2017-06-16T18:42:39Z","keywords":["perf","perf:responsiveness"],"id":1373773,"priority":"P3"},{"status":"NEW","last_change_time":"2024-01-22T14:38:36Z","creation_time":"2017-06-18T00:39:27Z","op_sys":"Unspecified","component":"JavaScript Engine","severity":"S3","summary":"substring shows up in Preact profiles","priority":"P3","keywords":["perf"],"id":1374011},{"id":1374354,"keywords":["perf"],"priority":"P3","summary":"SessionRestore slows down page loading of a new tab","severity":"S3","creation_time":"2017-06-19T17:47:13Z","component":"Session Restore","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:24:47Z"},{"op_sys":"Unspecified","component":"JavaScript Engine","creation_time":"2017-06-21T06:26:48Z","last_change_time":"2022-12-07T23:31:39Z","status":"NEW","summary":"Could js::NativeGetProperty be faster?","severity":"S3","priority":"P3","id":1374934,"keywords":[]},{"priority":"P2","keywords":["perf"],"id":1375022,"last_change_time":"2022-10-11T19:25:13Z","status":"NEW","component":"DOM: Copy & Paste and Drag & Drop","op_sys":"Unspecified","creation_time":"2017-06-21T13:35:54Z","severity":"S3","summary":"Consider removing the Msg_GetClipboard sync IPC"},{"summary":"GC: Do nursery allocation for external strings","severity":"S3","creation_time":"2017-06-22T16:41:42Z","component":"JavaScript: GC","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-08-20T13:10:44Z","id":1375565,"keywords":["perf"],"priority":"P2"},{"status":"NEW","last_change_time":"2022-10-11T19:26:18Z","creation_time":"2017-06-27T20:35:41Z","op_sys":"Unspecified","component":"JavaScript: GC","severity":"S3","summary":"finalisation slice can run late","priority":"P3","keywords":["perf"],"id":1376557},{"id":1377316,"keywords":["perf"],"priority":"P3","summary":"mozilla::DisplayItemData::AssertDisplayItemData is slow","severity":"S3","creation_time":"2017-06-29T23:00:47Z","component":"Web Painting","op_sys":"All","status":"NEW","last_change_time":"2022-10-11T19:26:50Z"},{"id":1377710,"keywords":["perf"],"priority":"P5","summary":"Compiling lots of unused branches can be expensive","severity":"N/A","component":"JavaScript Engine","op_sys":"Unspecified","creation_time":"2017-07-01T21:06:40Z","last_change_time":"2024-06-04T16:41:00Z","status":"NEW"},{"id":1379275,"keywords":["perf","perf:responsiveness","testcase-wanted"],"priority":"P3","summary":"Selectboxes/dropdowns in servicenow are laggy/difficult to use when dom.forms.select.customstyling is enabled","severity":"S3","component":"Layout: Form Controls","op_sys":"Unspecified","creation_time":"2017-07-07T20:33:05Z","last_change_time":"2024-09-08T13:06:36Z","status":"NEW"},{"severity":"S3","summary":"'Find Again' is slow","last_change_time":"2024-04-03T03:05:47Z","status":"NEW","component":"Find Backend","op_sys":"Unspecified","creation_time":"2017-07-12T13:25:59Z","keywords":["perf","perf:frontend"],"id":1380314,"priority":"P3"},{"keywords":["perf"],"id":1380773,"priority":"P5","severity":"S3","summary":"Consider adding large tenured promotion counts to MinorGC marker","status":"NEW","last_change_time":"2022-10-11T19:29:11Z","creation_time":"2017-07-13T19:25:32Z","component":"JavaScript: GC","op_sys":"All"},{"id":1381384,"keywords":["perf"],"priority":"P2","summary":"Performance analysis on gmail_ail_compose_new_mail_via_keyboard","severity":"S3","creation_time":"2017-07-17T05:56:16Z","op_sys":"Windows 10","component":"General","status":"NEW","last_change_time":"2022-10-11T19:29:33Z"},{"id":1382319,"keywords":["perf"],"priority":"P3","summary":"ABP causes us to spend 5x more time in selector matching on obama wikipedia page","severity":"S3","component":"CSS Parsing and Computation","op_sys":"Unspecified","creation_time":"2017-07-19T18:18:32Z","last_change_time":"2022-10-11T19:30:08Z","status":"NEW"},{"severity":"S3","summary":"Make QueryInterface use integer IDs","status":"NEW","last_change_time":"2022-10-11T19:31:34Z","creation_time":"2017-07-26T21:25:26Z","op_sys":"Unspecified","component":"XPCOM","keywords":[],"id":1384727,"priority":"--"},{"id":1384900,"keywords":["perf"],"priority":"P3","summary":"Array.prototype.sort is slow on very sparse arrays","severity":"S3","component":"JavaScript: Standard Library","op_sys":"Unspecified","creation_time":"2017-07-27T12:12:16Z","last_change_time":"2022-11-29T02:34:29Z","status":"NEW"},{"component":"Session Restore","op_sys":"Unspecified","creation_time":"2017-08-01T11:50:53Z","last_change_time":"2024-12-07T01:07:36Z","status":"NEW","summary":"Breaking FormData's collect loop into chunks to be executed in idle dispatch","severity":"S3","priority":"P3","id":1386206,"keywords":["perf:frontend","perf:responsiveness"]},{"priority":"P4","keywords":["perf:animation","perf:responsiveness"],"id":1387142,"status":"NEW","last_change_time":"2024-04-03T15:55:42Z","creation_time":"2017-08-03T17:32:57Z","op_sys":"All","component":"General","severity":"S3","summary":"Suppress window animation for New Window"},{"keywords":["perf"],"id":1388034,"priority":"P3","severity":"S3","summary":"Avoid extra string copies in RegExpGlobalReplaceOpt by returning the input string when no match was found","last_change_time":"2022-10-11T19:33:45Z","status":"NEW","component":"JavaScript: Standard Library","op_sys":"Unspecified","creation_time":"2017-08-07T12:03:22Z"},{"summary":"Suspend the taskbar refresh in WindowsJumpLists.jsm when computer becomes idle","severity":"S3","creation_time":"2017-08-08T07:48:04Z","component":"General","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:33:53Z","id":1388263,"keywords":["perf"],"priority":"P3"},{"priority":"P3","keywords":["perf","perf:frontend","perf:startup"],"id":1388758,"last_change_time":"2023-07-13T11:51:52Z","status":"NEW","component":"Session Restore","op_sys":"Unspecified","creation_time":"2017-08-09T14:58:43Z","severity":"S3","summary":"Restoring sessions with multiple windows is very slow"},{"last_change_time":"2024-03-22T08:01:19Z","status":"NEW","component":"Toolbars and Customization","op_sys":"Unspecified","creation_time":"2017-08-17T15:36:13Z","severity":"S3","summary":"The menu panel is painted several times when it's opened for the first time","priority":"P5","keywords":["perf:frontend"],"id":1391282},{"keywords":["perf"],"id":1391710,"priority":"P3","severity":"S3","summary":"Nightly 36% slower than Chrome on Mozilla Log Analyzer","last_change_time":"2024-05-08T17:30:15Z","status":"NEW","op_sys":"Unspecified","component":"JavaScript Engine","creation_time":"2017-08-18T17:52:24Z"},{"summary":"for-await-of with Async Generator is slow","severity":"S3","op_sys":"Unspecified","component":"JavaScript Engine","creation_time":"2017-08-25T08:54:48Z","last_change_time":"2024-04-30T16:49:52Z","status":"NEW","id":1393712,"keywords":["perf"],"priority":"P2"},{"summary":"Hasal input latency case facebook_ail_scroll_home_1_txt regressed median from 22ms to 44ms on 7/29","severity":"S3","creation_time":"2017-08-29T10:16:17Z","op_sys":"Unspecified","component":"JavaScript Engine","status":"NEW","last_change_time":"2022-10-11T19:38:20Z","id":1394761,"keywords":["perf"],"priority":"P3"},{"status":"NEW","last_change_time":"2023-07-19T05:30:13Z","creation_time":"2017-08-30T07:34:42Z","op_sys":"Unspecified","component":"Session Restore","severity":"S3","summary":"Breaking tab data collection into chunks","priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1395066},{"component":"DOM: Selection","op_sys":"Unspecified","creation_time":"2017-08-30T18:27:24Z","last_change_time":"2024-08-11T05:57:26Z","status":"NEW","summary":"Scripted modification of the selection can jank the browser","severity":"S3","priority":"P3","id":1395274,"keywords":["perf"]},{"severity":"S3","summary":"Investigate whether we can remove the browser-element-api:call JS sync IPC","last_change_time":"2022-10-11T19:39:00Z","status":"NEW","op_sys":"Unspecified","component":"DOM: Core & HTML","creation_time":"2017-09-01T04:22:34Z","keywords":["perf"],"id":1395813,"priority":"P3"},{"priority":"P3","id":1397450,"keywords":["perf","perf:responsiveness","perf:startup"],"creation_time":"2017-09-06T20:56:43Z","op_sys":"Unspecified","component":"Application Update","status":"NEW","last_change_time":"2022-10-11T19:40:26Z","summary":"Eliminate or at least lessen main thread IO in UpdateService.jsm","severity":"S3"},{"creation_time":"2017-09-07T01:01:23Z","component":"JavaScript: GC","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-12-07T23:33:15Z","summary":"Tune the nursery size to keep nursery collections under 5ms","severity":"S3","priority":"P3","id":1397549,"keywords":["perf"]},{"priority":"P3","id":1401214,"keywords":["perf:frontend","perf:startup"],"op_sys":"Unspecified","component":"Places","creation_time":"2017-09-19T15:02:46Z","last_change_time":"2023-07-19T05:31:28Z","status":"NEW","summary":"Investigate code early initializing the Places Connection on startup","severity":"S3"},{"status":"NEW","last_change_time":"2022-10-11T19:43:25Z","creation_time":"2017-09-19T20:52:23Z","op_sys":"Unspecified","component":"XSLT","severity":"S3","summary":"Loading HR4909 (Defense Authorization Act) takes a very long time and causes content process to hang","priority":"P3","keywords":["perf"],"id":1401345},{"creation_time":"2017-09-22T20:13:23Z","op_sys":"Unspecified","component":"General","status":"NEW","last_change_time":"2023-09-21T15:51:04Z","summary":"When clicking \"show sidebars\", resulting in not smooth page content shifting then resizing","severity":"S3","priority":"P3","id":1402458,"keywords":["perf:frontend"]},{"summary":"Janky scrolling on CXC2017 website","severity":"S3","op_sys":"Unspecified","component":"Graphics","creation_time":"2017-09-25T13:29:27Z","last_change_time":"2023-06-09T09:33:52Z","status":"NEW","id":1402844,"keywords":["perf","perf:responsiveness","reproducible"],"priority":"P3"},{"keywords":["perf:resource-use"],"id":1403823,"priority":"P3","severity":"S3","summary":"High CPU on twitch TV stream","last_change_time":"2024-05-06T04:45:30Z","status":"NEW","component":"Audio/Video: Playback","op_sys":"Windows 10","creation_time":"2017-09-28T05:26:40Z"},{"priority":"P3","keywords":["perf"],"id":1404950,"last_change_time":"2022-10-11T19:46:05Z","status":"NEW","component":"JavaScript Engine","op_sys":"Unspecified","creation_time":"2017-10-02T15:46:14Z","severity":"S3","summary":"new Promise(resolve => {}) is a performance footgun"},{"id":1414938,"keywords":["perf"],"priority":"P3","summary":"Spike in memory use when navigating away from a page that uses a lot of memory","severity":"S3","creation_time":"2017-11-06T20:13:20Z","component":"XPCOM","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T19:55:20Z"},{"severity":"S3","summary":"Prevent background thumbnails from causing high CPU usage","status":"NEW","last_change_time":"2024-04-03T15:59:35Z","creation_time":"2017-11-14T21:39:14Z","op_sys":"Unspecified","component":"General","keywords":["perf","perf:resource-use","power"],"id":1417221,"priority":"P3"},{"id":1417970,"keywords":[],"priority":"P3","summary":"Make recascading when only custom properties change cheaper","severity":"S3","op_sys":"Unspecified","component":"CSS Parsing and Computation","creation_time":"2017-11-16T16:16:12Z","last_change_time":"2024-10-31T10:09:27Z","status":"NEW"},{"keywords":["meta","perf"],"id":1419053,"priority":"P3","severity":"N/A","summary":"[meta] Firefox's disk write behaviour is worse than other browsers' in some situations","status":"NEW","last_change_time":"2023-03-22T11:33:52Z","creation_time":"2017-11-20T16:23:31Z","component":"General","op_sys":"Unspecified"},{"summary":"stylo: 6.21 - 6.54% remote-tsvg  / remote-twitter  (android-6-0-armv8-api16, android-7-1-armv8-api16) regression on push db56323cd08f4883e4824199b441a3141be655e5 (Thu Nov 23 2017)","severity":"S3","component":"CSS Parsing and Computation","op_sys":"Android","creation_time":"2017-11-24T09:21:58Z","last_change_time":"2022-10-11T20:00:41Z","status":"NEW","id":1420369,"keywords":["perf","regression"],"priority":"P2"},{"severity":"S3","summary":"Optimize the Function constructor","last_change_time":"2024-10-18T08:26:30Z","status":"NEW","op_sys":"All","component":"JavaScript Engine","creation_time":"2017-11-24T15:37:41Z","keywords":[],"id":1420440,"priority":"P3"},{"priority":"P5","keywords":["perf:frontend"],"id":1421463,"status":"NEW","last_change_time":"2023-07-19T05:33:33Z","creation_time":"2017-11-28T23:04:36Z","op_sys":"Unspecified","component":"Toolbars and Customization","severity":"S3","summary":"The reload button should not be temporarily disabled when loading about:home in a new window"},{"last_change_time":"2023-04-27T04:38:15Z","status":"NEW","op_sys":"Unspecified","component":"Places","creation_time":"2017-11-29T09:34:26Z","severity":"S3","summary":"Reduce the amount of I/O done by Places [meta]","priority":"P5","keywords":["meta"],"id":1421562},{"priority":"P2","id":1424740,"keywords":["perf:responsiveness"],"component":"DOM: Core & HTML","op_sys":"Unspecified","creation_time":"2017-12-11T16:41:25Z","last_change_time":"2022-10-11T21:05:35Z","status":"NEW","summary":"console.log of an object graph in a worker is very slow","severity":"S3"},{"component":"CSS Parsing and Computation","op_sys":"Linux","creation_time":"2017-12-13T15:50:00Z","last_change_time":"2024-01-21T08:23:41Z","status":"NEW","summary":"Firefox is very slow entering/leaving Twitter “lightbox” effects when the DOM is large","severity":"S3","priority":"P3","id":1425040,"keywords":["perf"]},{"id":1425083,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Gather Telemetry on synchronous reflows caused by browser UI on pre-release builds","severity":"S3","op_sys":"Unspecified","component":"General","creation_time":"2017-12-13T17:13:45Z","last_change_time":"2024-04-02T13:24:28Z","status":"NEW"},{"severity":"S3","summary":"Jupyter Lab very slow in Firefox, with rapid long flex reflows (triggered from JS .offsetTop calls)","last_change_time":"2022-10-11T21:06:00Z","status":"NEW","component":"Layout: Flexbox","op_sys":"All","creation_time":"2017-12-13T19:34:54Z","keywords":["perf","perf:responsiveness"],"id":1425106,"priority":"P3"},{"summary":"Avoid refresh driver ticks in windows that aren't ready for first paint yet","severity":"S3","op_sys":"Unspecified","component":"Layout","creation_time":"2017-12-20T18:29:56Z","last_change_time":"2022-10-11T21:07:16Z","status":"NEW","id":1426447,"keywords":[],"priority":"P3"},{"severity":"S3","summary":"Consider firing ViewShowing events before moving the \"panelview\" node","last_change_time":"2023-03-23T22:16:39Z","status":"NEW","component":"Toolbars and Customization","op_sys":"Unspecified","creation_time":"2018-01-22T14:34:52Z","keywords":["perf:frontend","perf:responsiveness"],"id":1432169,"priority":"P5"},{"keywords":["memory-footprint","perf","perf:resource-use"],"id":1436734,"priority":"P3","severity":"S4","summary":"pdf with many images uses a lot of memory on scrolling","last_change_time":"2024-05-02T16:08:59Z","status":"NEW","component":"PDF Viewer","op_sys":"Unspecified","creation_time":"2018-02-08T15:00:42Z"},{"keywords":["perf"],"id":1437914,"priority":"P3","severity":"S3","summary":"Typing 25-30 chars on an input with expensive regexp pattern causes browser to hang","status":"NEW","last_change_time":"2022-10-11T21:16:53Z","creation_time":"2018-02-13T16:04:33Z","op_sys":"Unspecified","component":"DOM: Editor"},{"severity":"S3","summary":"Allow to cancel page-icon fetches if the menu requesting them closes, or give those events a lower priority","last_change_time":"2023-05-22T15:41:24Z","status":"NEW","component":"Places","op_sys":"Unspecified","creation_time":"2018-02-16T21:07:53Z","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1438989,"priority":"P3"},{"keywords":["memory-footprint"],"id":1439412,"priority":"P3","severity":"S3","summary":"Linux: Evaluate only using fontconfig in the parent process","status":"NEW","last_change_time":"2023-02-28T16:07:16Z","creation_time":"2018-02-19T18:36:54Z","component":"Graphics: Text","op_sys":"Linux"},{"creation_time":"2018-03-08T05:32:23Z","op_sys":"Unspecified","component":"JavaScript: GC","status":"NEW","last_change_time":"2022-10-11T21:21:53Z","summary":"The collector should yield after nursery collection if the budget is exceeded","severity":"S3","priority":"P3","id":1444013,"keywords":[]},{"priority":"P3","id":1444886,"keywords":["perf:frontend","perf:responsiveness"],"creation_time":"2018-03-12T13:42:53Z","component":"Tabbed Browser","op_sys":"Unspecified","status":"NEW","last_change_time":"2023-03-23T15:16:51Z","summary":"When closing a tab, select the next tab at the same time as the closed tab disappears","severity":"S3"},{"severity":"S3","summary":"Unable to render specific PDF file.","status":"NEW","last_change_time":"2024-05-02T16:10:42Z","creation_time":"2018-03-14T19:14:46Z","op_sys":"All","component":"PDF Viewer","keywords":["testcase"],"id":1445735,"priority":"P3"},{"id":1445811,"keywords":["perf","perf:responsiveness"],"priority":"P2","summary":"Consider avoiding synchronously focusing elements as it triggers sync style flush","severity":"S3","creation_time":"2018-03-14T23:04:19Z","op_sys":"Unspecified","component":"General","status":"NEW","last_change_time":"2023-03-30T15:39:46Z"},{"priority":"P3","id":1447288,"keywords":["perf:startup"],"op_sys":"Windows","component":"General","creation_time":"2018-03-20T13:04:05Z","last_change_time":"2023-07-19T05:37:16Z","status":"NEW","summary":"Avoid alternating between the appstarting and the normal cursor before first paint","severity":"S3"},{"keywords":["perf"],"id":1448130,"priority":"P3","severity":"S3","summary":"Overpainting (full-area paint flashing) in browser UI (toolbars, devtools, sidebars) when resizing window","status":"NEW","last_change_time":"2022-10-11T21:25:18Z","creation_time":"2018-03-22T19:54:49Z","component":"Web Painting","op_sys":"Unspecified"},{"priority":"P3","id":1448783,"keywords":["perf","perf:startup"],"component":"Startup and Profile System","op_sys":"Unspecified","creation_time":"2018-03-26T08:23:28Z","last_change_time":"2024-05-02T16:13:02Z","status":"NEW","summary":"Firefox launcher is blocked in slow DNS queries for local hostname","severity":"S3"},{"last_change_time":"2023-03-23T15:16:04Z","status":"NEW","component":"General","op_sys":"Unspecified","creation_time":"2018-04-02T05:43:30Z","severity":"S4","summary":"The early blank window should use the about:home background color","priority":"P2","keywords":["perf:frontend","perf:startup","regression"],"id":1450626},{"priority":"P3","id":1451375,"keywords":["perf:frontend","perf:responsiveness"],"op_sys":"Unspecified","component":"Password Manager","creation_time":"2018-04-04T15:45:59Z","last_change_time":"2023-07-19T05:38:43Z","status":"NEW","summary":"nsLoginManager does main thread IO to query storage when the login list is shown","severity":"S3"},{"severity":"S3","summary":"Opening a new tab and then causing a Switch To tab from the AwesomeBar always results in a short spinner","status":"NEW","last_change_time":"2024-03-22T07:54:18Z","creation_time":"2018-04-04T16:42:23Z","component":"Tabbed Browser","op_sys":"Unspecified","keywords":["perf:frontend"],"id":1451401,"priority":"P3"},{"id":1452388,"keywords":["perf:frontend","perf:responsiveness"],"priority":"P3","summary":"PageThumbs spends an appreciable amount of time on the main thread","severity":"S3","op_sys":"Unspecified","component":"New Tab Page","creation_time":"2018-04-07T15:03:22Z","last_change_time":"2023-03-23T22:14:53Z","status":"NEW"},{"id":1452829,"keywords":[],"priority":"P3","summary":"Canvas is not optimized for clipping to rectangles","severity":"N/A","component":"Graphics","op_sys":"Unspecified","creation_time":"2018-04-10T00:53:37Z","last_change_time":"2022-12-16T12:46:30Z","status":"NEW"},{"id":1453351,"keywords":["perf"],"priority":"P3","summary":"[Form Autofill] Parsing Roll20 character sheet for phone numbers leads to janks","severity":"S3","op_sys":"Unspecified","component":"Form Autofill","creation_time":"2018-04-11T14:48:36Z","last_change_time":"2022-10-11T21:29:23Z","status":"NEW"},{"status":"NEW","last_change_time":"2023-07-19T05:40:16Z","creation_time":"2018-04-18T18:06:07Z","op_sys":"Unspecified","component":"Tabbed Browser","severity":"S3","summary":"Short spinner reported when tearing tabs out of a window","priority":"P3","keywords":["perf:frontend"],"id":1455058},{"priority":"P3","id":1455118,"keywords":["perf"],"creation_time":"2018-04-18T20:57:48Z","op_sys":"Unspecified","component":"Web Painting","status":"NEW","last_change_time":"2023-02-07T15:23:55Z","summary":"Scrolling is a bit janky in card mode at reddit (post-redesign), with long waits mid-refresh-driver-tick between \"reflow\" & \"display list\"","severity":"S3"},{"priority":"P3","keywords":[],"id":1456581,"last_change_time":"2022-10-11T21:31:49Z","status":"NEW","component":"Layout: Text and Fonts","op_sys":"Windows 10","creation_time":"2018-04-24T18:08:51Z","severity":"S3","summary":"Gmail Sent folder locks up browser for minutes"},{"creation_time":"2018-05-03T13:59:33Z","component":"Session Restore","op_sys":"Windows 10","status":"NEW","last_change_time":"2022-10-17T16:29:23Z","summary":"Window title in the taskbar changes multiple times when restoring session","severity":"S3","priority":"P3","id":1458894,"keywords":["perf:frontend"]},{"last_change_time":"2022-10-11T21:38:53Z","status":"NEW","op_sys":"Unspecified","component":"Layout","creation_time":"2018-05-29T20:06:59Z","severity":"S3","summary":"Nested grid/flex layout is slow in mobile UI at http://www.wikia.com/fandom","priority":"P3","keywords":["perf"],"id":1465205},{"op_sys":"All","component":"Layout: Text and Fonts","creation_time":"2018-06-04T22:41:15Z","last_change_time":"2024-10-29T01:54:38Z","status":"NEW","summary":"trying to View Source on twitter.com stalls out entire content process (spending lots of time in nsBidiPresUtils::TraverseFrames->nsBidiPresUtils::ResolveParagraph->SplitInlineAncestors)","severity":"S3","priority":"P3","id":1466704,"keywords":["perf"]},{"priority":"P3","id":1466922,"keywords":["perf"],"creation_time":"2018-06-05T19:30:25Z","op_sys":"Unspecified","component":"CSS Parsing and Computation","status":"NEW","last_change_time":"2023-02-14T17:24:45Z","summary":"Styling jank (134ms style flush) when loading new Reddit layout","severity":"S3"},{"priority":"P3","keywords":["perf"],"id":1469383,"status":"NEW","last_change_time":"2022-10-11T21:42:13Z","creation_time":"2018-06-18T19:50:53Z","op_sys":"Unspecified","component":"JavaScript Engine: JIT","severity":"S3","summary":"Duplicate stub attachment for GetProp in browser tests"},{"op_sys":"Unspecified","component":"Web Painting","creation_time":"2018-06-20T18:01:54Z","last_change_time":"2022-10-11T21:42:39Z","status":"NEW","summary":"Infinite painting on https://material.io/design/ (background image has animated SVG, but covered up by other stuff)","severity":"S3","priority":"P2","id":1469947,"keywords":[]},{"id":1475020,"keywords":[],"priority":"P3","summary":"Slow reflows at cnn.com slideshow, with lots of time spent in nested grid reflow","severity":"S3","op_sys":"Unspecified","component":"Layout","creation_time":"2018-07-11T20:02:04Z","last_change_time":"2022-10-11T21:46:37Z","status":"NEW"},{"summary":"Reduce duplication and unify responsibility for window sizing","severity":"S3","component":"General","op_sys":"Unspecified","creation_time":"2018-07-18T19:39:19Z","last_change_time":"2022-10-11T21:47:53Z","status":"NEW","id":1476748,"keywords":[],"priority":"P3"},{"summary":"2048game.com has worse performance in Firefox as compared to Chrome browser","severity":"S3","op_sys":"Unspecified","component":"General","creation_time":"2018-07-19T04:35:10Z","last_change_time":"2022-10-11T21:47:59Z","status":"NEW","id":1476857,"keywords":[],"priority":"P3"},{"op_sys":"Unspecified","component":"UI Widgets","creation_time":"2018-07-20T12:36:35Z","last_change_time":"2024-04-16T17:04:29Z","status":"NEW","summary":"Reduce reflows in autocomplete binding (adjustHeight and potentially handleOverflow?)","severity":"S3","priority":"P5","id":1477235,"keywords":["perf:frontend","perf:responsiveness"]},{"severity":"S3","summary":"Proactively warm up layers for the next (and previous?) tab when user presses ctrl (Win/Lin) or cmd (Mac)","last_change_time":"2023-09-21T15:50:25Z","status":"NEW","op_sys":"Unspecified","component":"Tabbed Browser","creation_time":"2018-07-26T15:28:37Z","keywords":["perf:frontend","perf:responsiveness"],"id":1478703,"priority":"P5"},{"summary":"URL bar seems to trigger multiple layouts when browser window is resized at certain sizes","severity":"S3","op_sys":"Unspecified","component":"Toolbars and Customization","creation_time":"2018-07-27T19:25:12Z","last_change_time":"2024-03-22T07:54:48Z","status":"NEW","id":1479083,"keywords":["perf","perf:frontend"],"priority":"P3"},{"creation_time":"2018-08-09T21:29:48Z","op_sys":"Unspecified","component":"DOM: Content Processes","status":"NEW","last_change_time":"2024-04-02T13:25:37Z","summary":"Lots of paints during tab switch","severity":"S3","priority":"P3","id":1482264,"keywords":["perf:resource-use","perf:responsiveness"]},{"id":1482654,"keywords":["perf:frontend"],"priority":"P3","summary":"1.43ms uninterruptible reflow at onxblunderflow@chrome://browser/content/tabbrowser.xml:47:11","severity":"S3","component":"Tabbed Browser","op_sys":"All","creation_time":"2018-08-11T16:33:53Z","last_change_time":"2024-04-03T03:06:04Z","status":"NEW"},{"severity":"S3","summary":"1.38ms uninterruptible reflow at recreatePopup@resource:///modules/UITour.jsm:1443:5","last_change_time":"2023-09-21T15:50:18Z","status":"NEW","component":"Tours","op_sys":"Linux","creation_time":"2018-08-11T23:21:57Z","keywords":["perf:frontend","perf:responsiveness"],"id":1482670,"priority":"P3"},{"id":1482671,"keywords":["perf:frontend","perf:responsiveness"],"priority":"P3","summary":"2.32ms uninterruptible reflow at showHighlightElement@resource:///modules/UITour.jsm:1046:24","severity":"S3","creation_time":"2018-08-11T23:22:41Z","component":"Tours","op_sys":"Linux","status":"NEW","last_change_time":"2024-04-03T17:59:14Z"},{"creation_time":"2018-08-12T20:37:09Z","op_sys":"Linux","component":"Tabbed Browser","status":"NEW","last_change_time":"2024-03-21T11:37:04Z","summary":"2.09ms uninterruptible reflow at onxbldragover@chrome://browser/content/tabbrowser.xml:1391:9","severity":"S3","priority":"P5","id":1482734,"keywords":["perf:frontend","perf:responsiveness"]},{"priority":"P3","keywords":["perf:responsiveness"],"id":1483268,"last_change_time":"2024-04-02T13:31:31Z","status":"NEW","op_sys":"Linux","component":"Toolbars and Customization","creation_time":"2018-08-14T15:44:10Z","severity":"S3","summary":"1.17ms uninterruptible reflow at showTooltip@chrome://browser/content/browser.js:4539:5"},{"keywords":["perf:responsiveness"],"id":1487303,"priority":"P3","severity":"S3","summary":"1.05ms uninterruptible reflow at openPopup/this._openPopupPromise<@resource:///modules/PanelMultiView.jsm:518:9","status":"NEW","last_change_time":"2024-03-21T11:33:28Z","creation_time":"2018-08-30T04:44:58Z","component":"Menus","op_sys":"Linux"},{"keywords":["perf:frontend","perf:responsiveness"],"id":1487822,"priority":"P3","severity":"S3","summary":"4.13ms uninterruptible reflow at openContextMenu@chrome://browser/content/nsContextMenu.js:80:3","last_change_time":"2023-09-21T16:04:43Z","status":"NEW","op_sys":"Linux","component":"Menus","creation_time":"2018-08-31T16:55:30Z"},{"last_change_time":"2024-04-02T13:31:44Z","status":"NEW","op_sys":"Unspecified","component":"Netmonitor","creation_time":"2018-08-31T22:04:45Z","severity":"S3","summary":"[meta] Network panel recording overhead","priority":"P2","keywords":["meta","perf:responsiveness"],"id":1487906},{"severity":"S3","summary":"Make StringBuilder::ToString look for characters to escape in each text node and attribute value only once","status":"NEW","last_change_time":"2023-03-17T05:38:28Z","creation_time":"2018-09-06T07:10:04Z","op_sys":"Unspecified","component":"DOM: Core & HTML","keywords":[],"id":1489036,"priority":"P3"},{"creation_time":"2018-09-10T19:32:52Z","op_sys":"All","component":"Tabbed Browser","status":"NEW","last_change_time":"2024-04-03T03:06:13Z","summary":"Put <browser> elements from closed <tab>'s into a queue to be destroyed during idle time","severity":"S3","priority":"P3","id":1490095,"keywords":["perf:frontend"]},{"summary":"400ms browser jank after transition between normal and full-screen video","severity":"S3","component":"DOM: Animation","op_sys":"Unspecified","creation_time":"2018-09-11T22:44:34Z","last_change_time":"2022-10-11T21:58:39Z","status":"NEW","id":1490510,"keywords":["perf","regression"],"priority":"P3"},{"severity":"S3","summary":"Slow restyles when loading cnn.com in network panel","last_change_time":"2022-10-11T21:59:09Z","status":"NEW","component":"CSS Parsing and Computation","op_sys":"Unspecified","creation_time":"2018-09-13T19:47:37Z","keywords":[],"id":1491111,"priority":"P3"},{"priority":"P3","keywords":["perf"],"id":1493218,"last_change_time":"2022-10-11T22:00:55Z","status":"NEW","component":"Graphics","op_sys":"Windows 10","creation_time":"2018-09-21T16:39:05Z","severity":"S3","summary":"GitHub PDF render is about 6x slower in Firefox compared to Chrome or Edge"},{"keywords":[],"id":1493603,"priority":"P3","severity":"S3","summary":"External loads needlessly force creating an about:blank content viewer with confusing (wrong?) unload semantics","last_change_time":"2022-10-11T22:01:16Z","status":"NEW","op_sys":"Unspecified","component":"DOM: Navigation","creation_time":"2018-09-24T09:24:50Z"},{"priority":"P2","id":1493609,"keywords":["perf:resource-use","perf:responsiveness"],"creation_time":"2018-09-24T09:46:35Z","component":"General","op_sys":"Unspecified","status":"NEW","last_change_time":"2023-09-21T16:05:15Z","summary":"We're sometimes creating an about:blank document in the sidebar browser when the window opens","severity":"S3"},{"creation_time":"2018-09-24T11:50:13Z","op_sys":"Unspecified","component":"General","status":"NEW","last_change_time":"2024-02-27T18:22:03Z","summary":"window.open creates an initial about:blank window twice","severity":"S3","priority":"P3","id":1493643,"keywords":[]},{"severity":"S3","summary":"Handle case when compositor receives layers but MozLayerTreeReady will not be serviced by the parent in time","last_change_time":"2024-03-21T11:31:28Z","status":"NEW","op_sys":"Unspecified","component":"Graphics: Layers","creation_time":"2018-09-24T17:36:46Z","keywords":["perf:responsiveness"],"id":1493751,"priority":"P3"},{"severity":"S3","summary":"www.google.com - Doodle stutters while playing when using Direct2D canvas","last_change_time":"2022-10-11T22:02:17Z","status":"NEW","component":"Graphics: Canvas2D","op_sys":"Windows 10","creation_time":"2018-09-27T11:13:44Z","keywords":[],"id":1494623,"priority":"P3"},{"severity":"S3","summary":"Call browser.deprioritize() on the preloaded browser after it has been created","status":"NEW","last_change_time":"2024-04-02T13:32:39Z","creation_time":"2018-10-03T21:36:27Z","op_sys":"Unspecified","component":"New Tab Page","keywords":["perf:resource-use","perf:responsiveness"],"id":1496235,"priority":"P3"},{"priority":"P2","id":1496554,"keywords":["perf","perf:responsiveness"],"creation_time":"2018-10-04T19:47:18Z","op_sys":"All","component":"Audio/Video: Playback","status":"NEW","last_change_time":"2022-10-03T12:25:27Z","summary":"MediaDecoder threads can contend on the allocator lock too much","severity":"--"},{"priority":"P3","keywords":[],"id":1497626,"status":"NEW","last_change_time":"2022-10-11T22:04:38Z","creation_time":"2018-10-09T19:23:46Z","op_sys":"Unspecified","component":"DOM: Navigation","severity":"S3","summary":"Investigate if back/forward/reload from UI could interrupt JS"},{"priority":"P2","keywords":["perf:responsiveness"],"id":1498459,"last_change_time":"2022-10-11T22:05:24Z","status":"NEW","op_sys":"Unspecified","component":"Web Painting","creation_time":"2018-10-12T03:41:50Z","severity":"S3","summary":"Twitter spends a lot of time building display lists."},{"id":1501415,"keywords":[],"priority":"P3","summary":"5+ second delay before first paint, when loading 27mb plaintext log file","severity":"S3","component":"Layout: Text and Fonts","op_sys":"Unspecified","creation_time":"2018-10-23T19:39:44Z","last_change_time":"2022-10-11T22:07:54Z","status":"NEW"},{"keywords":["perf:pageload"],"id":1503119,"priority":"P3","severity":"S3","summary":"A lot of time spent in query_selector","last_change_time":"2022-10-11T22:09:15Z","status":"NEW","op_sys":"Unspecified","component":"DOM: CSS Object Model","creation_time":"2018-10-30T04:56:35Z"},{"severity":"S3","summary":"Large local files with many pictures load extremely slow","last_change_time":"2022-10-24T12:17:33Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2018-10-30T19:11:27Z","keywords":["perf:pageload"],"id":1503371,"priority":"P3"},{"last_change_time":"2024-02-23T20:08:07Z","status":"NEW","op_sys":"Unspecified","component":"Networking","creation_time":"2018-10-31T21:35:04Z","severity":"S3","summary":"Very high CPU usage on fast.com","priority":"P2","keywords":["perf:resource-use"],"id":1503704},{"creation_time":"2018-11-01T11:06:02Z","component":"Performance","op_sys":"Linux","status":"NEW","last_change_time":"2024-07-01T14:38:10Z","summary":"Firefox significantly impacted by high CPU load compared to other browsers / programs","severity":"S3","priority":"P3","id":1503830,"keywords":["perf:responsiveness"]},{"keywords":["perf","perf:pageload"],"id":1504337,"priority":"P5","severity":"S3","summary":"Consider if it makes sense to use HTTP1.1 on cellular connections","status":"NEW","last_change_time":"2022-10-11T22:10:18Z","creation_time":"2018-11-02T21:20:04Z","op_sys":"Unspecified","component":"Performance"},{"priority":"--","id":1505531,"keywords":["main-thread-io","perf:frontend"],"op_sys":"Unspecified","component":"Crash Reporting","creation_time":"2018-11-07T19:21:08Z","last_change_time":"2024-03-20T19:58:34Z","status":"NEW","summary":"Crash report fetching from about:support, and probably about:crashes, is slow due to main thread IO","severity":"S3"},{"component":"General","op_sys":"Unspecified","creation_time":"2018-11-07T19:49:51Z","last_change_time":"2024-04-02T13:35:26Z","status":"NEW","summary":"Investigate moving about:support to the (privileged?) child process","severity":"S3","priority":"P3","id":1505537,"keywords":["perf:responsiveness"]},{"severity":"S3","summary":"get*State should return an object instead of a serialized string","last_change_time":"2024-06-28T12:13:06Z","status":"NEW","op_sys":"Unspecified","component":"Session Restore","creation_time":"2018-11-07T21:05:14Z","keywords":["perf:resource-use","perf:responsiveness"],"id":1505572,"priority":"P2"},{"id":1506331,"keywords":["perf","perf:resource-use","regression"],"priority":"P3","summary":"High CPU utilization when rapidly hovering over tabs","severity":"S3","creation_time":"2018-11-10T06:34:37Z","component":"Tabbed Browser","op_sys":"All","status":"NEW","last_change_time":"2022-10-11T22:12:13Z"},{"priority":"P3","keywords":[],"id":1512973,"status":"NEW","last_change_time":"2024-04-23T15:24:50Z","creation_time":"2018-12-10T14:19:24Z","op_sys":"All","component":"Networking","severity":"S3","summary":"incrementally decode base64 data urls"},{"summary":"Move ReprotectRegion and mprotect off the main thread","severity":"S3","creation_time":"2018-12-14T04:27:08Z","component":"JavaScript Engine: JIT","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T22:18:41Z","id":1514113,"keywords":[],"priority":"P3"},{"last_change_time":"2024-04-03T16:01:42Z","status":"NEW","op_sys":"All","component":"Tabbed Browser","creation_time":"2018-12-18T10:06:12Z","severity":"S3","summary":"Avoid putting the URL in the tab title when loading an about: page","priority":"P3","keywords":["perf","perf:animation"],"id":1515003},{"priority":"P3","keywords":["perf:responsiveness"],"id":1515780,"status":"NEW","last_change_time":"2023-06-14T21:23:08Z","creation_time":"2018-12-20T21:51:35Z","component":"DOM: Device Interfaces","op_sys":"Unspecified","severity":"S3","summary":"Consider more aggressively throttling deviceorientation events"},{"id":1517509,"keywords":["perf:responsiveness"],"priority":"P2","summary":"Coalesce wheel events at the refresh driver level instead of at the IPC boundary","severity":"S3","creation_time":"2019-01-03T16:17:03Z","component":"DOM: UI Events & Focus Handling","op_sys":"All","status":"NEW","last_change_time":"2023-04-21T08:06:42Z"},{"creation_time":"2019-01-03T17:49:57Z","component":"JavaScript Engine: JIT","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-10-09T00:52:22Z","summary":"Poor performance of simple \"vector\" operations on arrays","severity":"N/A","priority":"P3","id":1517534,"keywords":["perf","perf:responsiveness"]},{"summary":"Skeletal Animation: Slow (FPS) on Firefox compare to Chrome","severity":"S3","creation_time":"2019-01-05T04:24:31Z","component":"JavaScript Engine: JIT","op_sys":"Linux","status":"NEW","last_change_time":"2024-09-04T04:33:43Z","id":1517916,"keywords":["perf","perf:responsiveness"],"priority":"P2"},{"status":"NEW","last_change_time":"2022-10-11T22:22:44Z","creation_time":"2019-01-09T18:01:15Z","component":"JavaScript Engine: JIT","op_sys":"All","severity":"S3","summary":"provide optimized implementations of float modulus","priority":"P2","keywords":["perf:responsiveness"],"id":1518857},{"priority":"P3","keywords":["perf:responsiveness"],"id":1519513,"status":"NEW","last_change_time":"2022-10-11T22:23:16Z","creation_time":"2019-01-11T20:20:17Z","component":"Layout: Text and Fonts","op_sys":"Unspecified","severity":"S3","summary":"Can spend a really long time hanging the main thread in the parent process running gfxMacFontFamily::FindStyleVariations"},{"id":1520932,"keywords":["perf:resource-use"],"priority":"P3","summary":"Spurious Choreographer vsync messages when running tests","severity":"S3","creation_time":"2019-01-17T21:53:02Z","component":"General","op_sys":"Android","status":"NEW","last_change_time":"2022-10-11T22:24:19Z"},{"priority":"P3","keywords":["perf:startup"],"id":1521839,"last_change_time":"2022-10-11T22:25:12Z","status":"NEW","component":"DOM: Content Processes","op_sys":"Unspecified","creation_time":"2019-01-22T18:04:05Z","severity":"S3","summary":"Try launching privileged content process asynchronously as soon as possible after main process start"},{"keywords":["perf:responsiveness"],"id":1522311,"priority":"P3","severity":"S3","summary":"On Android, scrolling m.imgur.com displays blank frames for long periods of time and shows images with a delay","last_change_time":"2022-10-11T22:25:43Z","status":"NEW","op_sys":"All","component":"Performance","creation_time":"2019-01-23T22:50:33Z"},{"status":"NEW","last_change_time":"2022-10-11T22:26:54Z","creation_time":"2019-01-30T23:31:28Z","op_sys":"Unspecified","component":"DOM: Content Processes","severity":"S3","summary":"Consider lowering priority for offscreen iFrame processes in foreground tabs","priority":"P3","keywords":["perf:resource-use"],"id":1524104},{"last_change_time":"2022-03-02T16:28:52Z","status":"NEW","op_sys":"Linux","component":"JavaScript Engine: JIT","creation_time":"2019-02-05T12:33:39Z","severity":"S4","summary":"RSA Encrypt is VERY SLOW in firefox","priority":"P3","keywords":["perf","perf:responsiveness"],"id":1525260},{"severity":"S3","summary":"[ARM64] Sometimes very laggy tab switching","last_change_time":"2022-10-11T22:28:37Z","status":"NEW","op_sys":"Unspecified","component":"Graphics","creation_time":"2019-02-08T20:55:27Z","keywords":["perf:responsiveness"],"id":1526487,"priority":"P3"},{"priority":"P3","keywords":["main-thread-io","perf","perf:responsiveness"],"id":1529283,"status":"NEW","last_change_time":"2023-09-21T18:03:29Z","creation_time":"2019-02-20T15:16:38Z","component":"XPCOM","op_sys":"Unspecified","severity":"S3","summary":"nsAnonTempFileRemover::RemoveAnonTempFileFiles does main thread I/O off a timer"},{"severity":"S3","summary":"New tab page instances use more memory than new browser.xhtml instances and they shouldn't","last_change_time":"2024-06-28T12:16:01Z","status":"NEW","op_sys":"Unspecified","component":"New Tab Page","creation_time":"2019-02-20T16:39:34Z","keywords":["memory-footprint","perf:frontend","perf:resource-use"],"id":1529309,"priority":"P2"},{"priority":"P3","id":1529343,"keywords":["perf","perf:responsiveness"],"op_sys":"Unspecified","component":"JavaScript Engine: JIT","creation_time":"2019-02-20T18:26:23Z","last_change_time":"2024-10-24T17:10:00Z","status":"NEW","summary":"JavaScript algebra calculation on FireFox is slower than on Chrome","severity":"S4"},{"last_change_time":"2024-04-02T13:40:30Z","status":"NEW","op_sys":"Unspecified","component":"Pocket","creation_time":"2019-02-25T20:07:37Z","severity":"S3","summary":"SaveToPocket.jsm is initialized before first paint","priority":"P3","keywords":["perf:responsiveness","perf:startup"],"id":1530478},{"severity":"S3","summary":"Convert more parts of browser_startup.js to an allow list","last_change_time":"2023-06-13T14:42:13Z","status":"NEW","component":"General","op_sys":"Unspecified","creation_time":"2019-02-25T20:11:37Z","keywords":["perf:startup"],"id":1530479,"priority":"P3"},{"id":1531123,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Upload speed is very slow in comparison to the expected. Works fine with both Chrome and Explorer.","severity":"S3","component":"Networking","op_sys":"Unspecified","creation_time":"2019-02-27T20:26:43Z","last_change_time":"2023-03-15T09:37:24Z","status":"NEW"},{"priority":"P3","id":1532115,"keywords":["perf:resource-use"],"component":"Performance","op_sys":"Windows 10","creation_time":"2019-03-03T00:49:36Z","last_change_time":"2022-10-11T22:33:30Z","status":"NEW","summary":"[arm64-windows] Idle battery consumption on imgur is almost 2x higher than Edge","severity":"S3"},{"severity":"S3","summary":"Speakerdeck expensive paints for switching slides","last_change_time":"2022-10-11T22:34:04Z","status":"NEW","op_sys":"macOS","component":"Graphics","creation_time":"2019-03-05T17:46:01Z","keywords":["perf","perf:responsiveness"],"id":1532720,"priority":"P3"},{"component":"Settings UI","op_sys":"Unspecified","creation_time":"2019-03-08T15:55:39Z","last_change_time":"2023-09-21T16:12:08Z","status":"NEW","summary":"Preferences always initialize all the panes through findInPage.js initialization","severity":"S3","priority":"P1","id":1533771,"keywords":["perf:frontend","perf:resource-use"]},{"id":1534745,"keywords":["perf:startup","reproducible"],"priority":"P3","summary":"cookies.sqlite is read on the main thread before first paint","severity":"S3","component":"Networking: Cookies","op_sys":"Unspecified","creation_time":"2019-03-12T18:35:26Z","last_change_time":"2024-05-02T16:16:21Z","status":"NEW"},{"last_change_time":"2023-02-07T15:20:23Z","status":"NEW","component":"Web Painting","op_sys":"Unspecified","creation_time":"2019-03-13T20:36:32Z","severity":"S3","summary":"nsLayoutUtils::DisplayRootHasRetainedDisplayListBuilder is slow","priority":"P3","keywords":["perf:responsiveness"],"id":1535134},{"priority":"P3","id":1535381,"keywords":["perf:resource-use"],"creation_time":"2019-03-14T17:24:19Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-05-16T09:06:48Z","summary":"Experiment with setting thread affinity in worker threads","severity":"S3"},{"keywords":["perf:resource-use"],"id":1537652,"priority":"P3","severity":"S3","summary":"Investigate more selective compacting GC.","status":"NEW","last_change_time":"2022-10-11T22:38:00Z","creation_time":"2019-03-21T03:31:10Z","component":"JavaScript: GC","op_sys":"Unspecified"},{"severity":"S3","summary":"Schedule nursery GC and slices around requestAnimationFrame","status":"NEW","last_change_time":"2022-10-11T22:38:22Z","creation_time":"2019-03-22T00:38:10Z","component":"JavaScript: GC","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1538053,"priority":"P3"},{"summary":"Investigate performance impact of tuning the number of SSL Cert threads on low-end hardware","severity":"S3","creation_time":"2019-04-01T12:08:05Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T22:40:51Z","id":1540683,"keywords":["perf:pageload"],"priority":"P3"},{"keywords":["perf","perf:responsiveness"],"id":1540812,"priority":"P3","severity":"S3","summary":"document.lastModified for local XML documents shouldn't cause main thread IO","last_change_time":"2022-10-11T22:40:58Z","status":"NEW","component":"DOM: Core & HTML","op_sys":"Unspecified","creation_time":"2019-04-01T18:41:02Z"},{"id":1540832,"keywords":["perf:frontend","perf:resource-use","perf:responsiveness"],"priority":"P3","summary":"Consider using idle task for preloaded new tab browsers created when opening new tabs","severity":"S3","component":"Tabbed Browser","op_sys":"Unspecified","creation_time":"2019-04-01T20:10:50Z","last_change_time":"2023-09-21T16:13:59Z","status":"NEW"},{"summary":"SandboxBroker is eagerly stat'ing various directories during start-up before opening the first window","severity":"S3","op_sys":"Windows","component":"Security: Process Sandboxing","creation_time":"2019-04-02T22:12:12Z","last_change_time":"2022-10-11T22:41:24Z","status":"NEW","id":1541246,"keywords":["perf:startup"],"priority":"P3"},{"summary":"Ensure we're properly prefetching OSX shared libs with ReadAheadLib","severity":"S3","creation_time":"2019-04-03T20:33:26Z","op_sys":"macOS","component":"Startup and Profile System","status":"NEW","last_change_time":"2022-10-11T22:41:45Z","id":1541575,"keywords":["perf:startup"],"priority":"P3"},{"summary":"Windows: Reduce querying for volume information","severity":"S3","creation_time":"2019-04-03T21:15:34Z","component":"Widget: Win32","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-05-02T16:01:17Z","id":1541593,"keywords":["main-thread-io","perf","perf:startup"],"priority":"P3"},{"last_change_time":"2024-04-03T03:06:46Z","status":"NEW","op_sys":"Unspecified","component":"Firefox Accounts","creation_time":"2019-04-04T20:03:31Z","severity":"S3","summary":"FxA toolbar icon flicker on browser startup","priority":"P2","keywords":["perf:frontend"],"id":1542031},{"id":1542995,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Thousands of window.onload events creates high memory/CPU until it crashes","severity":"S3","creation_time":"2019-04-09T06:36:28Z","op_sys":"All","component":"General","status":"NEW","last_change_time":"2022-10-11T22:43:01Z"},{"creation_time":"2019-04-11T16:33:10Z","op_sys":"Unspecified","component":"Preferences: Backend","status":"NEW","last_change_time":"2022-10-11T22:43:42Z","summary":"Stop reading all files in both $app/defaults/prefs/*.js *and* $app/defaults/preferences/*.js","severity":"S3","priority":"P5","id":1543746,"keywords":["main-thread-io","perf:startup"]},{"priority":"P5","id":1543752,"keywords":["main-thread-io","perf","perf:startup"],"creation_time":"2019-04-11T16:46:23Z","op_sys":"Unspecified","component":"Preferences: Backend","status":"NEW","last_change_time":"2023-11-21T20:01:21Z","summary":"Stop reading user.js from the profile to modify default prefs unless prefs.js opts in to doing so","severity":"S3"},{"summary":"Investigate optimizing IO for script cache file access","severity":"S3","op_sys":"Unspecified","component":"XPCOM","creation_time":"2019-04-12T15:22:51Z","last_change_time":"2024-04-03T17:56:46Z","status":"NEW","id":1544034,"keywords":["main-thread-io","perf","perf:startup"],"priority":"--"},{"severity":"S3","summary":"Investigate loading early libraries with RTLD_DEEPBIND for WebRender talos wins","last_change_time":"2022-10-11T22:45:30Z","status":"NEW","op_sys":"Android","component":"Graphics: WebRender","creation_time":"2019-04-18T20:38:24Z","keywords":["perf"],"id":1545578,"priority":"P3"},{"keywords":["perf:frontend","perf:startup"],"id":1547139,"priority":"P3","severity":"S3","summary":"Make AddonManager startup less expensive in a brand new profile or after an update","status":"NEW","last_change_time":"2023-06-15T03:02:27Z","creation_time":"2019-04-25T23:15:34Z","op_sys":"Unspecified","component":"Add-ons Manager"},{"priority":"--","id":1554667,"keywords":["main-thread-io","perf:responsiveness"],"component":"XPCOM","op_sys":"Unspecified","creation_time":"2019-05-27T13:33:20Z","last_change_time":"2023-06-15T18:42:19Z","status":"NEW","summary":"Consider introducing a NS_CloseInBackground(PRFileDesc*) function","severity":"S3"},{"creation_time":"2019-05-29T22:35:11Z","op_sys":"Unspecified","component":"JavaScript Engine","status":"NEW","last_change_time":"2024-08-14T04:41:55Z","summary":"Enable JavaScript Startup Bytecode Cache for DevTools code","severity":"S3","priority":"P2","id":1555522,"keywords":["perf:responsiveness"]},{"summary":"Reduce TouchBar NSImage creation","severity":"S3","creation_time":"2019-06-04T10:18:59Z","op_sys":"Unspecified","component":"Widget: Cocoa","status":"NEW","last_change_time":"2024-04-03T03:06:48Z","id":1556688,"keywords":["perf:frontend","regression"],"priority":"P2"},{"summary":"Switching to \"Tags\" in Reply by Buffer hangs the process (slow querySelectorAll)","severity":"S3","creation_time":"2019-06-14T16:28:15Z","component":"CSS Parsing and Computation","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T22:58:24Z","id":1559438,"keywords":["perf:responsiveness"],"priority":"P3"},{"id":1562490,"keywords":["hang","nightly-community","perf","perf:frontend","reproducible"],"priority":"P5","summary":"Deleting large amount of bookmarks and folders hangs/locks/freezes Mozilla Firefox completely for some time","severity":"S3","op_sys":"Windows 7","component":"Bookmarks & History","creation_time":"2019-06-30T18:47:03Z","last_change_time":"2024-11-13T20:14:38Z","status":"NEW"},{"priority":"P2","id":1565019,"keywords":[],"component":"Networking","op_sys":"macOS","creation_time":"2019-07-10T19:53:42Z","last_change_time":"2025-01-02T09:55:53Z","status":"NEW","summary":"High CPU usage in parent process main thread when loading tripadvisor.ca, for over 700ms","severity":"S3"},{"status":"NEW","last_change_time":"2022-10-11T23:06:44Z","creation_time":"2019-07-22T17:54:50Z","op_sys":"Android","component":"Panning and Zooming","severity":"S3","summary":"Scrolling sometimes reacts late on touch input on Android","priority":"P3","keywords":["perf:responsiveness","stalled"],"id":1567977},{"priority":"P3","id":1568730,"keywords":["perf:responsiveness","perf:startup"],"component":"Graphics: Layers","op_sys":"Unspecified","creation_time":"2019-07-25T04:47:28Z","last_change_time":"2024-03-20T19:06:07Z","status":"NEW","summary":"Content process stalls in SyncObjectD3D11Client::Synchronize during startup","severity":"S3"},{"id":1569412,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Firefox 68 on wife's MacBook Air 2015 macOS 10.14.5 is getting dreadfully slow and no way to find out why","severity":"S3","creation_time":"2019-07-27T15:05:59Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T23:07:46Z"},{"status":"NEW","last_change_time":"2023-09-21T16:21:19Z","creation_time":"2019-07-31T10:59:00Z","component":"Settings UI","op_sys":"Unspecified","severity":"S3","summary":"Opening the preferences page calls HomePage -> getHomepagePref 80 times","priority":"P3","keywords":["perf:frontend","perf:resource-use","perf:startup"],"id":1570271},{"summary":"Consider using line cursor for nsBlockFrame::AddFrames","severity":"S3","creation_time":"2019-07-31T18:33:34Z","op_sys":"Unspecified","component":"Layout","status":"NEW","last_change_time":"2022-10-11T23:08:37Z","id":1570417,"keywords":["perf:responsiveness"],"priority":"--"},{"op_sys":"Unspecified","component":"Widget: Win32","creation_time":"2019-08-01T11:09:55Z","last_change_time":"2022-05-02T16:01:39Z","status":"NEW","summary":"::RegisterDragDrop does main thread I/O during startup","severity":"S3","priority":"P3","id":1570613,"keywords":["main-thread-io","perf:startup"]},{"priority":"P3","id":1570770,"keywords":["perf:responsiveness"],"creation_time":"2019-08-01T20:52:28Z","op_sys":"Unspecified","component":"Layout","status":"NEW","last_change_time":"2022-10-11T23:08:59Z","summary":"Incremental reflows on New-tab page are showing up in profiler","severity":"S3"},{"op_sys":"Unspecified","component":"Console","creation_time":"2019-08-04T15:07:54Z","last_change_time":"2022-10-11T23:09:31Z","status":"NEW","summary":"Firefox won't able to handle requests correctly this leads to slow down or crash the browsers","severity":"S3","priority":"P3","id":1571286,"keywords":["perf:responsiveness"]},{"summary":"Tons of time spent on the main thread when animations are accelerated in nsIFrame::IsScrolledOutOfView.","severity":"S3","component":"CSS Transitions and Animations","op_sys":"Unspecified","creation_time":"2019-08-06T17:47:17Z","last_change_time":"2022-10-11T23:10:02Z","status":"NEW","id":1571800,"keywords":["perf","perf:responsiveness"],"priority":"P3"},{"severity":"S3","summary":"GV should disable logging by default in opt GV builds","status":"NEW","last_change_time":"2022-12-22T21:49:54Z","creation_time":"2019-08-08T20:18:08Z","component":"General","op_sys":"All","keywords":["perf:pageload"],"id":1572540,"priority":"P3"},{"status":"NEW","last_change_time":"2024-04-02T13:42:42Z","creation_time":"2019-08-14T14:58:15Z","component":"Graphics","op_sys":"Unspecified","severity":"S3","summary":"Stoping using sync ipc for gfx sanity test","priority":"P3","keywords":["perf:startup"],"id":1573852},{"summary":"make telemetry bits around arrays relatively more efficient","severity":"S3","creation_time":"2019-08-15T15:02:34Z","component":"Telemetry","op_sys":"All","status":"NEW","last_change_time":"2024-04-29T09:31:32Z","id":1574172,"keywords":[],"priority":"P3"},{"severity":"S3","summary":"Create an automated test to ensure we use subpixel AA for titlebar/tabstrip/toolbar text rendering in WebRender","last_change_time":"2022-07-28T12:56:16Z","status":"NEW","op_sys":"All","component":"Theme","creation_time":"2019-08-22T03:38:38Z","keywords":["perf:frontend"],"id":1575743,"priority":"P3"},{"priority":"P3","id":1578123,"keywords":["perf:resource-use","power","reproducible"],"component":"Web Painting","op_sys":"macOS","creation_time":"2019-09-02T01:02:24Z","last_change_time":"2024-04-18T07:17:39Z","status":"NEW","summary":"Throttle the refresh driver in the parent process for occluded windows to reduce CPU","severity":"--"},{"priority":"P3","id":1579211,"keywords":["perf:frontend","perf:startup"],"creation_time":"2019-09-05T20:11:47Z","component":"Session Restore","op_sys":"macOS","status":"NEW","last_change_time":"2023-08-04T22:05:11Z","summary":"Treat minimized windows like unloaded tabs","severity":"N/A"},{"priority":"--","keywords":["main-thread-io","perf:startup"],"id":1579607,"status":"NEW","last_change_time":"2023-09-21T16:23:48Z","creation_time":"2019-09-07T06:45:10Z","op_sys":"Linux","component":"Widget: Gtk","severity":"S3","summary":"Linux: tons of stat calls for gtk icons on startup"},{"last_change_time":"2024-05-02T16:17:44Z","status":"NEW","component":"Shell Integration","op_sys":"Unspecified","creation_time":"2019-09-11T22:52:06Z","severity":"S3","summary":"Startup default browser check causes mainthread IO on Linux","priority":"P3","keywords":["main-thread-io","perf","perf:startup","reproducible"],"id":1580638},{"keywords":["main-thread-io","perf","perf:startup"],"id":1580654,"priority":"P5","severity":"S3","summary":"Linux sandbox code does mainthread IO to check if all the allowed directories are directories","status":"NEW","last_change_time":"2023-08-04T22:04:16Z","creation_time":"2019-09-12T00:19:36Z","component":"Security: Process Sandboxing","op_sys":"Linux"},{"priority":"P3","id":1580656,"keywords":["main-thread-io","perf","perf:resource-use"],"creation_time":"2019-09-12T00:40:25Z","component":"Graphics: Text","op_sys":"Linux","status":"NEW","last_change_time":"2023-04-24T17:46:06Z","summary":"Do not scan for new fonts so aggressively on Linux","severity":"S3"},{"priority":"P3","keywords":["perf:responsiveness"],"id":1581296,"last_change_time":"2024-08-24T04:24:52Z","status":"NEW","component":"Layout: Block and Inline","op_sys":"Unspecified","creation_time":"2019-09-14T09:57:52Z","severity":"S3","summary":"Freeze / terrible performance with the attached test case"},{"keywords":["perf:responsiveness"],"id":1581978,"priority":"P3","severity":"S3","summary":"High GPU on elements with multiple shadows","status":"NEW","last_change_time":"2022-10-11T23:20:09Z","creation_time":"2019-09-17T22:27:15Z","op_sys":"Unspecified","component":"Graphics"},{"last_change_time":"2024-05-08T09:42:58Z","status":"NEW","component":"Session Restore","op_sys":"Unspecified","creation_time":"2019-09-23T22:29:16Z","severity":"S3","summary":"Recently closed tabs menu is slow due to giant (several mb) data URIs stored for closed tab favicons","priority":"P3","keywords":["perf:frontend"],"id":1583384},{"op_sys":"Windows 10","component":"SVG","creation_time":"2019-09-27T02:18:23Z","last_change_time":"2024-07-23T03:28:17Z","status":"NEW","summary":"High CPU usage on Firefox likely due to hidden loading spinners","severity":"S3","priority":"P3","id":1584418,"keywords":["perf:resource-use"]},{"priority":"--","keywords":["main-thread-io","perf"],"id":1586808,"last_change_time":"2022-10-11T23:25:33Z","status":"NEW","op_sys":"Unspecified","component":"XPCOM","creation_time":"2019-10-07T15:49:31Z","severity":"S3","summary":"GetProductDirectory does too much mainthread IO"},{"id":1587040,"keywords":["perf:resource-use"],"priority":"P3","summary":"VSync firing 255 times more frequently than normal during \"display off\" sleep on Windows","severity":"S3","creation_time":"2019-10-08T10:57:40Z","component":"Graphics","op_sys":"Windows","status":"NEW","last_change_time":"2023-02-23T12:47:47Z"},{"priority":"P3","id":1589085,"keywords":["perf:responsiveness"],"component":"File Handling","op_sys":"Unspecified","creation_time":"2019-10-16T13:13:10Z","last_change_time":"2023-09-21T16:25:22Z","status":"NEW","summary":"Protocol and MIME info handler service access in the child process causes synchronous IPC","severity":"S3"},{"status":"NEW","last_change_time":"2024-11-15T17:47:07Z","creation_time":"2019-10-21T10:29:23Z","op_sys":"Linux","component":"Graphics","severity":"S3","summary":"Fullscreen switching is slow with many tabs","priority":"P3","keywords":["perf","perf:responsiveness","regression"],"id":1590057},{"status":"NEW","last_change_time":"2023-04-06T06:04:34Z","creation_time":"2019-10-24T10:13:25Z","op_sys":"All","component":"Graphics: ImageLib","severity":"S4","summary":"Images flash when returning to a tab","priority":"P3","keywords":["perf","perf:responsiveness"],"id":1591030},{"summary":"YouTube live streaming is janky and sometimes the image would freeze completely.","severity":"S3","creation_time":"2019-10-29T18:17:41Z","component":"Performance","op_sys":"Windows 10","status":"NEW","last_change_time":"2022-10-11T23:31:12Z","id":1592366,"keywords":["nightly-community","perf:responsiveness"],"priority":"P3"},{"priority":"--","id":1596634,"keywords":["perf:responsiveness"],"component":"Graphics","op_sys":"Unspecified","creation_time":"2019-11-15T02:15:29Z","last_change_time":"2022-10-11T23:36:12Z","status":"NEW","summary":"When blur filter is applied on a large area, it delays the full rendering","severity":"S3"},{"op_sys":"All","component":"General","creation_time":"2019-11-18T16:39:02Z","last_change_time":"2023-08-05T13:41:49Z","status":"NEW","summary":"Find and get rid of XBL sync binding hacks in front-end code","severity":"N/A","priority":"P3","id":1597318,"keywords":["perf:frontend"]},{"priority":"P3","id":1598356,"keywords":["perf:responsiveness"],"component":"Audio/Video: Playback","op_sys":"Unspecified","creation_time":"2019-11-21T16:53:39Z","last_change_time":"2022-10-11T23:38:19Z","status":"NEW","summary":"Very long main-thread hangs when visiting YouTube in Nightly launched from DMG image - blocked launching the RDD process","severity":"S3"},{"op_sys":"macOS","component":"Graphics","creation_time":"2019-11-25T19:40:17Z","last_change_time":"2022-10-11T23:39:14Z","status":"NEW","summary":"Huge GUI lag when adjusting SVG","severity":"S3","priority":"P3","id":1599216,"keywords":["perf:responsiveness"]},{"priority":"P3","id":1599472,"keywords":["perf:pageload"],"creation_time":"2019-11-26T15:54:32Z","component":"DOM: Networking","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-10-11T23:39:31Z","summary":"Stream the output of inflate in nsHTTPCompressConv::OnDataAvailable out to another thread to be converted to UTF16 when possible","severity":"S3"},{"op_sys":"Unspecified","component":"DOM: Networking","creation_time":"2019-11-26T16:48:09Z","last_change_time":"2022-10-11T23:39:32Z","status":"NEW","summary":"For large json payloads, convert to UTF16 off the main thread","severity":"S3","priority":"P3","id":1599489,"keywords":["perf:pageload"]},{"summary":"Enabling Safebrowsing is introducing significant noise in network throttled pageload tests","severity":"S3","creation_time":"2019-11-26T17:27:49Z","op_sys":"Unspecified","component":"Performance","status":"NEW","last_change_time":"2022-10-11T23:39:34Z","id":1599508,"keywords":["perf:pageload"],"priority":"P3"},{"component":"New Tab Page","op_sys":"Unspecified","creation_time":"2019-12-06T17:05:09Z","last_change_time":"2022-10-11T23:42:39Z","status":"NEW","summary":"Browsing from about:blank to a URL runs activity-stream code and does an about:newtab reflow","severity":"S3","priority":"P3","id":1602025,"keywords":["perf:pageload"]},{"keywords":["main-thread-io","perf:responsiveness"],"id":1602434,"priority":"P3","severity":"S3","summary":"FileChannel::MakeFileInputStream does mainthread IO via nsIFile::IsDirectory","status":"NEW","last_change_time":"2024-04-03T16:52:39Z","creation_time":"2019-12-09T13:32:18Z","op_sys":"Unspecified","component":"Networking: File"},{"severity":"S3","summary":"Slow layout on longer WebSocket tables","status":"NEW","last_change_time":"2022-10-12T14:12:43Z","creation_time":"2019-12-12T01:03:26Z","component":"Netmonitor","op_sys":"Unspecified","keywords":["perf","perf:responsiveness"],"id":1603302,"priority":"P3"},{"priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1603449,"status":"NEW","last_change_time":"2022-10-11T23:44:17Z","creation_time":"2019-12-12T14:58:40Z","component":"Reader Mode","op_sys":"All","severity":"S3","summary":"Sync layout flush at the end of page load due to poor interaction between reader mode and add-ons"},{"priority":"--","keywords":["perf:frontend"],"id":1605486,"status":"NEW","last_change_time":"2024-03-20T19:04:10Z","creation_time":"2019-12-20T21:52:09Z","op_sys":"Unspecified","component":"Session Restore","severity":"S3","summary":"Reused selected tab is removed and then re-added to tabstrip when restoring session data including a selected tab"},{"summary":"Slashdot tab has consistently high energy impact (score of >19)","severity":"S3","component":"Performance","op_sys":"Unspecified","creation_time":"2019-12-20T23:24:52Z","last_change_time":"2022-10-11T23:46:42Z","status":"NEW","id":1605513,"keywords":["perf:resource-use"],"priority":"P3"},{"priority":"P3","keywords":["meta","perf:pageload"],"id":1608826,"last_change_time":"2023-10-11T10:42:03Z","status":"NEW","op_sys":"All","component":"General","creation_time":"2020-01-13T14:33:42Z","severity":"N/A","summary":"[meta] Geckoview load initiation performance"},{"last_change_time":"2023-07-13T02:01:54Z","status":"NEW","component":"Performance","op_sys":"Unspecified","creation_time":"2020-01-23T21:25:39Z","severity":"S3","summary":"Identify Mozilla libraries built for Android that could be built with optimizations for speed","priority":"P2","keywords":["perf:pageload","perf:startup"],"id":1611279},{"creation_time":"2020-02-10T18:26:12Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-01-02T02:01:25Z","summary":"High CPU/janky performance when dragging on Tradingview charts","severity":"S3","priority":"P3","id":1614415,"keywords":["perf:responsiveness"]},{"priority":"P2","keywords":["perf","perf:frontend","regression"],"id":1614689,"status":"NEW","last_change_time":"2024-04-03T16:05:44Z","creation_time":"2020-02-11T16:14:33Z","op_sys":"All","component":"Address Bar","severity":"S3","summary":"0.12ms uninterruptible reflow at _ensureFormattedHostVisible/<@resource:///modules/UrlbarValueFormatter.sys.mjs:96:9"},{"priority":"P3","id":1618001,"keywords":["perf:resource-use"],"creation_time":"2020-02-25T20:22:09Z","op_sys":"Unspecified","component":"General","status":"NEW","last_change_time":"2024-12-20T16:25:16Z","summary":"Make React and friends shared vendored libraries instead of having multiple instances","severity":"S3"},{"status":"NEW","last_change_time":"2022-10-12T00:01:07Z","creation_time":"2020-03-01T15:49:46Z","component":"Graphics","op_sys":"Android","severity":"S3","summary":"poll widget on tagesspiegel.de very laggy","priority":"P3","keywords":[],"id":1619141},{"severity":"S3","summary":"Large amounts of time are spent in module import when starting Fenix (applink)","status":"NEW","last_change_time":"2024-11-15T17:53:34Z","creation_time":"2020-03-04T22:40:00Z","component":"General","op_sys":"All","keywords":["perf:responsiveness"],"id":1620079,"priority":"P2"},{"keywords":[],"id":1621021,"priority":"P3","severity":"S3","summary":"Running Basemark Web 3.0 test in a background tab seems to bog down the compositor","status":"NEW","last_change_time":"2022-03-16T02:36:18Z","creation_time":"2020-03-09T15:21:36Z","component":"Graphics","op_sys":"Unspecified"},{"last_change_time":"2024-04-02T13:46:28Z","status":"NEW","component":"Crash Reporting","op_sys":"Unspecified","creation_time":"2020-03-20T22:59:40Z","severity":"S3","summary":"Rename LastCrash file to _LastCrash","priority":"--","keywords":["perf:startup"],"id":1624060},{"priority":"P2","keywords":["perf:responsiveness"],"id":1624846,"last_change_time":"2022-10-12T00:05:28Z","status":"NEW","op_sys":"Unspecified","component":"DOM: Core & HTML","creation_time":"2020-03-25T12:58:57Z","severity":"S3","summary":"autocomplete.js is excessively slow - only in Firefox"},{"priority":"--","keywords":["main-thread-io","perf","perf:startup","reproducible"],"id":1625271,"last_change_time":"2024-05-02T16:22:46Z","status":"NEW","op_sys":"Unspecified","component":"Add-ons Manager","creation_time":"2020-03-26T18:44:58Z","severity":"S3","summary":"getNewSideloads checks for system add-ons last modified time on the main thread at the end of startup"},{"keywords":["main-thread-io","perf","perf:frontend","perf:responsiveness"],"id":1626009,"priority":"P3","severity":"S3","summary":"Prefs do mainthread IO on all helper apps off disk when they load","status":"NEW","last_change_time":"2024-03-20T19:03:05Z","creation_time":"2020-03-30T16:35:47Z","op_sys":"Unspecified","component":"Settings UI"},{"id":1626263,"keywords":["perf:resource-use"],"priority":"P3","summary":"High CPU load while waiting for a page to load (MacOS)","severity":"S3","op_sys":"Unspecified","component":"Graphics","creation_time":"2020-03-31T13:41:34Z","last_change_time":"2022-05-12T12:27:43Z","status":"NEW"},{"id":1626719,"keywords":["nightly-community","perf:responsiveness"],"priority":"P3","summary":"Firefox Nightly hangs when displaying a Grafana","severity":"S3","op_sys":"Windows 10","component":"JavaScript Engine","creation_time":"2020-04-01T19:12:10Z","last_change_time":"2024-11-12T18:19:47Z","status":"NEW"},{"id":1629649,"keywords":["memory-leak","perf:resource-use","regression"],"priority":"P3","summary":"Excessive memory usage on 32gb machine","severity":"--","component":"Performance","op_sys":"Unspecified","creation_time":"2020-04-13T20:27:10Z","last_change_time":"2022-04-07T16:17:14Z","status":"NEW"},{"severity":"--","summary":"Determine what DLLs should be prefetched from dependentlibs.list","status":"NEW","last_change_time":"2024-03-20T18:57:21Z","creation_time":"2020-05-05T23:44:09Z","op_sys":"Unspecified","component":"Startup and Profile System","keywords":["perf:startup"],"id":1635620,"priority":"P3"},{"last_change_time":"2022-03-02T16:38:20Z","status":"NEW","component":"Graphics: CanvasWebGL","op_sys":"Android","creation_time":"2020-05-19T17:40:49Z","severity":"S3","summary":"Unacceptable performance and memory consumption on Apart Posters VR experience.","priority":"P2","keywords":["perf:responsiveness"],"id":1639280},{"severity":"S4","summary":"Memory leak in foreground webworker","status":"NEW","last_change_time":"2024-11-12T17:41:30Z","creation_time":"2020-06-03T16:48:21Z","op_sys":"All","component":"JavaScript: GC","keywords":["perf:resource-use"],"id":1643064,"priority":"P3"},{"priority":"P3","id":1643226,"keywords":["perf:responsiveness"],"creation_time":"2020-06-04T03:42:40Z","component":"Performance","op_sys":"Windows 10","status":"NEW","last_change_time":"2023-01-27T13:48:17Z","summary":"[performance] Very high CPU usage and slow scrolling","severity":"--"},{"keywords":["nightly-community","perf:resource-use"],"id":1646496,"priority":"P3","severity":"--","summary":"Memory leak degradation","last_change_time":"2022-04-07T16:18:44Z","status":"NEW","component":"Performance","op_sys":"Linux","creation_time":"2020-06-17T20:06:18Z"},{"status":"NEW","last_change_time":"2023-01-27T13:46:23Z","creation_time":"2020-06-24T19:55:26Z","op_sys":"macOS","component":"Performance","severity":"S3","summary":"High CPU usage by idle Firefox","priority":"P3","keywords":["perf:resource-use"],"id":1648233},{"priority":"P3","id":1648793,"keywords":["perf:responsiveness"],"component":"Performance","op_sys":"Windows 10","creation_time":"2020-06-26T16:00:22Z","last_change_time":"2022-04-07T16:19:01Z","status":"NEW","summary":"Stuttering while scrolling on dual displays with game or video playing in one screen (Nvidia 2070, 2x 1440p@144hz)","severity":"--"},{"priority":"--","keywords":["perf:pageload"],"id":1650063,"last_change_time":"2022-03-02T16:39:14Z","status":"NEW","op_sys":"Unspecified","component":"CSS Parsing and Computation","creation_time":"2020-07-02T12:30:31Z","severity":"S3","summary":"Loading https://www.worldometers.info/coronavirus/#countries is occasionally slow, takes lots of time in query_selector_slow"},{"last_change_time":"2024-04-16T01:34:38Z","status":"NEW","component":"Site Reports","op_sys":"Android","creation_time":"2020-07-03T04:45:51Z","severity":"S2","summary":"lazy-loading images don't always show up (until you scroll past them) on https://terraria.gamepedia.com/Guide:Walkthrough","priority":"P3","keywords":["webcompat:needs-diagnosis"],"id":1650288},{"severity":"S3","summary":"Tab loading takes a very long time after a new startup or a restart","status":"NEW","last_change_time":"2024-05-02T16:32:58Z","creation_time":"2020-07-08T18:01:19Z","component":"General","op_sys":"Windows 10","keywords":["perf","perf:responsiveness","perf:startup"],"id":1651434,"priority":"P3"},{"last_change_time":"2022-03-09T16:32:38Z","status":"NEW","op_sys":"Windows 10","component":"Performance","creation_time":"2020-07-11T20:51:55Z","severity":"S4","summary":"ts_paint_webext regression due to a performance cliff (tripped in the second instance by separating out opensearch initialization )","priority":"P3","keywords":["perf:startup","regression"],"id":1652273},{"priority":"P3","id":1652793,"keywords":["perf:responsiveness"],"component":"Performance","op_sys":"Unspecified","creation_time":"2020-07-14T16:00:26Z","last_change_time":"2022-06-20T08:15:16Z","status":"NEW","summary":"Firefox gradually becomes slower to respond, until it becomes completely unresponsive","severity":"--"},{"severity":"S3","summary":"Firefox taking up CPU (fans going crazy) on realsimple.com","status":"NEW","last_change_time":"2023-01-27T13:43:24Z","creation_time":"2020-07-18T23:15:21Z","op_sys":"Unspecified","component":"Layout","keywords":["perf:resource-use"],"id":1653809,"priority":"P3"},{"summary":"Page load for about:logins is slow on Windows","severity":"S3","component":"about:logins","op_sys":"Windows","creation_time":"2020-08-12T16:40:23Z","last_change_time":"2024-04-02T16:15:51Z","status":"NEW","id":1658766,"keywords":["perf","perf:frontend"],"priority":"P2"},{"severity":"--","summary":"Jank when closing tabs in a full tab bar from session restore","last_change_time":"2022-04-07T16:19:22Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2020-08-15T18:14:00Z","keywords":["perf:responsiveness"],"id":1659286,"priority":"P3"},{"severity":"S3","summary":"Geektyrant takes 4x as long as Chrome to load","status":"NEW","last_change_time":"2023-07-04T21:52:42Z","creation_time":"2020-08-18T20:45:42Z","component":"Layout: Grid","op_sys":"Unspecified","keywords":["perf:pageload"],"id":1659831,"priority":"--"},{"id":1661941,"keywords":["main-thread-io","perf:responsiveness"],"priority":"--","summary":"WebBrowserPersistSerialize actor does mainthread IO","severity":"S3","creation_time":"2020-08-29T22:16:34Z","component":"DOM: Core & HTML","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-03-02T16:40:14Z"},{"id":1667248,"keywords":["perf:pageload"],"priority":"P3","summary":"Fenix loads cloudflare.com 5 seconds slower than Chrome","severity":"S3","op_sys":"Unspecified","component":"Performance","creation_time":"2020-09-24T22:25:35Z","last_change_time":"2022-04-07T16:20:56Z","status":"NEW"},{"priority":"P2","id":1667250,"keywords":["perf:pageload"],"creation_time":"2020-09-24T22:28:02Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-03-02T16:40:39Z","summary":"Fenix loads adobe.com 4 seconds slower than Chrome","severity":"S3"},{"severity":"N/A","summary":"Speculatively parse async and link preload scripts","status":"NEW","last_change_time":"2022-08-30T17:30:35Z","creation_time":"2020-09-28T22:58:27Z","op_sys":"Unspecified","component":"Performance","keywords":[],"id":1667904,"priority":"P2"},{"component":"XPCOM","op_sys":"Unspecified","creation_time":"2020-10-05T18:14:28Z","last_change_time":"2024-06-28T12:21:34Z","status":"NEW","summary":"Investigate relaxing windows timer granularity, especially on battery, to reduce energy use","severity":"--","priority":"--","id":1669307,"keywords":["perf:resource-use"]},{"severity":"S3","summary":"Massive memory leak when using the browser console","status":"NEW","last_change_time":"2024-03-20T18:53:58Z","creation_time":"2020-10-08T17:47:10Z","component":"Console","op_sys":"Unspecified","keywords":["perf","perf:resource-use"],"id":1670060,"priority":"P2"},{"severity":"--","summary":"Laggy Performance in bartamanpatrika.com in fenix","last_change_time":"2022-04-07T16:21:02Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2020-10-28T20:32:15Z","keywords":["perf:responsiveness"],"id":1673988,"priority":"P3"},{"creation_time":"2020-11-09T17:12:11Z","component":"XPCOM","op_sys":"Unspecified","status":"NEW","last_change_time":"2023-01-27T13:23:05Z","summary":"High memory and CPU usage on www.tvnow.de with garbage collector involved","severity":"S3","priority":"--","id":1676210,"keywords":["memory-footprint","perf","perf:responsiveness"]},{"severity":"S4","summary":"http requests to localhost ports where nothing is listening take longer to fail than in blink","last_change_time":"2022-03-02T16:41:05Z","status":"NEW","op_sys":"All","component":"Networking","creation_time":"2020-11-12T15:52:18Z","keywords":["perf","perf:pageload"],"id":1676889,"priority":"P3"},{"summary":"More checkerboarding than Edge on politico.com, on a two core machine","severity":"--","creation_time":"2020-11-25T19:37:06Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-04-07T16:21:43Z","id":1679309,"keywords":["nightly-community","perf:responsiveness"],"priority":"P3"},{"priority":"P3","keywords":["perf:responsiveness"],"id":1679770,"status":"NEW","last_change_time":"2022-04-07T16:22:13Z","creation_time":"2020-11-30T13:11:46Z","op_sys":"Unspecified","component":"Performance","severity":"--","summary":"Add improved telemetry for paint responsiveness"},{"status":"NEW","last_change_time":"2022-03-02T16:41:27Z","creation_time":"2020-11-30T19:46:07Z","component":"Security: Process Sandboxing","op_sys":"Linux","severity":"S3","summary":"HTMLCanvasElement.getContext is slow","priority":"P5","keywords":[],"id":1679863},{"id":1680860,"keywords":["meta","perf:responsiveness"],"priority":"P3","summary":"[meta] Performance investigations surrounding large IndexedDB responses","severity":"S4","op_sys":"All","component":"Storage: IndexedDB","creation_time":"2020-12-05T01:25:45Z","last_change_time":"2024-12-13T15:53:54Z","status":"NEW"},{"priority":"P3","keywords":["perf:pageload"],"id":1681088,"last_change_time":"2022-04-07T16:22:23Z","status":"NEW","component":"Performance","op_sys":"Unspecified","creation_time":"2020-12-07T15:55:49Z","severity":"--","summary":"Consider making speculative connections to minimize redirection time"},{"id":1682163,"keywords":["perf:resource-use"],"priority":"P3","summary":"Excessive memory use causing Firefox Quantum and other app crashes","severity":"S3","op_sys":"Unspecified","component":"Graphics: WebRender","creation_time":"2020-12-13T11:12:12Z","last_change_time":"2024-04-03T02:15:48Z","status":"NEW"},{"status":"NEW","last_change_time":"2023-01-27T13:40:55Z","creation_time":"2020-12-14T11:15:49Z","op_sys":"Unspecified","component":"Audio/Video: Playback","severity":"S3","summary":"http://www.jabra.com.de claims up to 20% CPU load as background tab or when Firefox is hidden","priority":"P3","keywords":["perf","perf:resource-use","power"],"id":1682261},{"priority":"--","id":1682986,"keywords":["perf:responsiveness"],"creation_time":"2020-12-16T23:01:37Z","component":"Graphics: Canvas2D","op_sys":"Android","status":"NEW","last_change_time":"2022-03-02T16:41:43Z","summary":"Choppy Canvas2D on Android on this page","severity":"S3"},{"priority":"P3","id":1683250,"keywords":["perf:responsiveness"],"creation_time":"2020-12-18T05:43:00Z","component":"Graphics: WebRender","op_sys":"Android","status":"NEW","last_change_time":"2022-03-02T16:41:44Z","summary":"Laggy swipes on swiperjs.com","severity":"S4"},{"priority":"P3","keywords":["perf:responsiveness"],"id":1683354,"status":"NEW","last_change_time":"2024-02-27T18:27:19Z","creation_time":"2020-12-18T17:37:18Z","op_sys":"Android","component":"Graphics: WebRender","severity":"S4","summary":"[Bug] Scrolling stutter on gadgets.ndtv.com website"},{"id":1683560,"keywords":["perf:responsiveness","regression"],"priority":"P3","summary":"Huge performance regression in webgame on https://project-f.github.io","severity":"S3","component":"Performance","op_sys":"Windows 10","creation_time":"2020-12-20T17:53:30Z","last_change_time":"2022-03-02T16:41:49Z","status":"NEW"},{"priority":"P3","id":1684233,"keywords":["nightly-community"],"component":"Performance","op_sys":"Unspecified","creation_time":"2020-12-26T05:40:05Z","last_change_time":"2022-08-31T11:57:52Z","status":"NEW","summary":"NYmag article causes laptop fans to kick in","severity":"S3"},{"keywords":["perf","perf:frontend","perf:responsiveness"],"id":1685140,"priority":"P3","severity":"S3","summary":"Noticeable UI lag when deleting lots of history entries because TopSitesFeed.refresh is called for every single one","status":"NEW","last_change_time":"2024-04-03T13:48:35Z","creation_time":"2021-01-05T18:58:03Z","component":"Top Sites","op_sys":"Unspecified"},{"severity":"--","summary":"Too many tabs of one site can cause Firefox to lag","last_change_time":"2022-04-07T16:22:28Z","status":"NEW","op_sys":"Windows 10","component":"Performance","creation_time":"2021-01-09T03:18:07Z","keywords":["perf:resource-use","regression"],"id":1685835,"priority":"P3"},{"severity":"S3","summary":"Large number of idle processes (with fork server enabled?)","last_change_time":"2022-10-11T23:58:11Z","status":"NEW","op_sys":"Linux","component":"General","creation_time":"2021-01-18T20:44:14Z","keywords":["perf:resource-use"],"id":1687376,"priority":"P2"},{"priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"id":1688073,"status":"NEW","last_change_time":"2024-03-20T18:52:32Z","creation_time":"2021-01-21T20:44:06Z","component":"Bookmarks & History","op_sys":"Unspecified","severity":"S3","summary":"Showing the bookmarks toolbar (Ctrl+Shift+B) janks the parent process for several seconds when there are many windows"},{"severity":"S3","summary":"Slow scrolling on weather.com today page","status":"NEW","last_change_time":"2023-07-23T23:05:10Z","creation_time":"2021-01-29T22:22:40Z","component":"Graphics: WebRender","op_sys":"Unspecified","keywords":["nightly-community"],"id":1689746,"priority":"P3"},{"priority":"P3","keywords":["perf:resource-use","power"],"id":1690654,"status":"NEW","last_change_time":"2024-07-23T03:17:08Z","creation_time":"2021-02-03T21:20:38Z","op_sys":"All","component":"Graphics: WebRender","severity":"S3","summary":"Detect no-op renders during frame building and avoid the render, to reduce power usage"},{"priority":"--","keywords":["perf:resource-use","reproducible"],"id":1691100,"status":"NEW","last_change_time":"2024-06-28T12:20:21Z","creation_time":"2021-02-05T17:07:58Z","component":"Performance","op_sys":"Unspecified","severity":"--","summary":"suspend cpu to background tabs"},{"keywords":["perf:responsiveness"],"id":1694420,"priority":"--","severity":"S4","summary":"Opening large data URLs in a new tab is very slow to display text in URL bar","last_change_time":"2022-03-02T16:42:51Z","status":"NEW","component":"Layout: Text and Fonts","op_sys":"Unspecified","creation_time":"2021-02-23T15:39:36Z"},{"priority":"P3","id":1695232,"keywords":["perf:responsiveness","reproducible"],"creation_time":"2021-02-26T14:49:51Z","component":"General","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-08-31T12:12:04Z","summary":"JS/DOM/Layout Jank from telemetry.mozilla.org dashboard","severity":"S3"},{"id":1698338,"keywords":["power"],"priority":"P2","summary":"Ads on https://www.golem.de/ cause a permanent ~50% load of Firefox","severity":"S3","creation_time":"2021-03-14T09:11:18Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-09-15T14:51:30Z"},{"summary":"Consider auto-terminating slow scripts if they are running in a process only serving ads","severity":"S4","op_sys":"Unspecified","component":"XPConnect","creation_time":"2021-03-23T15:31:54Z","last_change_time":"2022-12-01T02:46:30Z","status":"NEW","id":1700377,"keywords":["perf:resource-use"],"priority":"P3"},{"creation_time":"2021-04-30T19:28:55Z","component":"Tours","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-04-28T14:19:42Z","summary":"UITour should not iterate through all browser windows for every closed tab","severity":"S3","priority":"--","id":1708802,"keywords":["perf:frontend","perf:responsiveness"]},{"status":"NEW","last_change_time":"2024-10-29T14:11:04Z","creation_time":"2021-05-03T19:31:39Z","op_sys":"macOS","component":"Networking","severity":"S3","summary":"Switch from select() to poll for MacOS to reduce CPU usage","priority":"P2","keywords":["perf:resource-use","power"],"id":1709175},{"severity":"S3","summary":"When restarting after an upgrade Firefox hangs...","last_change_time":"2022-08-31T12:34:24Z","status":"NEW","component":"Layout: Text and Fonts","op_sys":"Windows 10","creation_time":"2021-05-27T14:21:23Z","keywords":["perf:startup"],"id":1713129,"priority":"P5"},{"id":1719164,"keywords":["parity-chrome","perf:responsiveness"],"priority":"P2","summary":"Terrible stuttering of mouse and \"drag preview\" on https://codepen.io/trending if you click-and-drag on a pen . Hang on Parent Process","severity":"S3","component":"Web Painting","op_sys":"Windows","creation_time":"2021-07-05T14:07:36Z","last_change_time":"2024-09-04T14:00:22Z","status":"NEW"},{"priority":"P3","id":1722060,"keywords":["memory-footprint","perf:resource-use"],"op_sys":"Unspecified","component":"Graphics","creation_time":"2021-07-23T17:39:44Z","last_change_time":"2024-02-27T16:13:03Z","status":"NEW","summary":"Leaving Firefox open for a few hours makes it use 51 gigs of RAM","severity":"S3"},{"component":"Networking: File","op_sys":"All","creation_time":"2021-07-26T13:07:58Z","last_change_time":"2024-04-03T16:54:50Z","status":"NEW","summary":"Setting default downloads directory to unavailable windows share makes opening settings cause several seconds of parent process mainthread jank (net_GetURLSpecFromFile causes slow mainthread IO)","severity":"S3","priority":"P3","id":1722304,"keywords":["main-thread-io","perf"]},{"summary":"Performance regressions from turning on bfcache-in-parent for fission, mostly in warmload","severity":"S3","creation_time":"2021-07-28T02:36:30Z","op_sys":"All","component":"DOM: Navigation","status":"NEW","last_change_time":"2023-01-09T10:42:57Z","id":1722641,"keywords":["perf:pageload","regression"],"priority":"P2"},{"summary":"Juddering on touchpad scroll on Facebook Marketplace","severity":"S4","op_sys":"Unspecified","component":"Graphics: WebRender","creation_time":"2021-07-28T18:07:54Z","last_change_time":"2022-03-02T16:44:22Z","status":"NEW","id":1722764,"keywords":["perf:responsiveness"],"priority":"--"},{"priority":"P3","id":1723891,"keywords":["perf:pageload"],"op_sys":"Windows 10","component":"JavaScript Engine","creation_time":"2021-08-04T04:37:00Z","last_change_time":"2022-03-08T14:16:57Z","status":"NEW","summary":"outlook.live.com responsiveness login is bad at login time","severity":"S3"},{"priority":"--","id":1724660,"keywords":["perf:responsiveness"],"creation_time":"2021-08-09T05:51:39Z","component":"Graphics: ImageLib","op_sys":"Android","status":"NEW","last_change_time":"2022-03-02T16:44:30Z","summary":"Virtual book rendering is janky on zoom","severity":"S3"},{"keywords":["perf","perf:responsiveness"],"id":1724783,"priority":"P3","severity":"--","summary":"Poor performance printing to PDF from large documents","last_change_time":"2022-04-07T16:24:49Z","status":"NEW","component":"Performance","op_sys":"Unspecified","creation_time":"2021-08-09T20:02:01Z"},{"component":"Graphics: WebRender","op_sys":"macOS","creation_time":"2021-08-10T15:05:29Z","last_change_time":"2023-01-27T13:26:56Z","status":"NEW","summary":"Firefox causes excess WindowServer CPU usage","severity":"S3","priority":"--","id":1724952,"keywords":["perf:resource-use"]},{"keywords":["perf:resource-use"],"id":1725178,"priority":"P3","severity":"--","summary":"Worse CPU usage on twitch than Edge/Chrome","status":"NEW","last_change_time":"2024-09-15T12:54:02Z","creation_time":"2021-08-11T14:23:52Z","component":"Performance","op_sys":"Unspecified"},{"severity":"--","summary":"Higher power usage on gem.cbc.ca in Firefox than Chrome on macOS (2019 MBP 10.15)","last_change_time":"2022-03-02T16:44:52Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2021-08-24T16:19:24Z","keywords":["perf:resource-use"],"id":1727370,"priority":"--"},{"severity":"S3","summary":"WebGL shader compilation janks scrolling on this page","status":"NEW","last_change_time":"2022-03-02T16:45:09Z","creation_time":"2021-09-14T19:43:45Z","component":"Graphics: CanvasWebGL","op_sys":"All","keywords":["perf:responsiveness"],"id":1730761,"priority":"--"},{"keywords":["perf:responsiveness"],"id":1732144,"priority":"--","severity":"S3","summary":"Janky scrolling on intab.io (dual core CPU)","last_change_time":"2022-12-23T10:39:35Z","status":"NEW","op_sys":"Unspecified","component":"Graphics: WebRender","creation_time":"2021-09-22T16:56:32Z"},{"status":"NEW","last_change_time":"2024-03-27T02:32:57Z","creation_time":"2021-09-22T22:12:49Z","component":"Graphics: WebRender","op_sys":"Android","severity":"S4","summary":"Pinch to zoom lag in fenix on gsmarena's desktop site","priority":"--","keywords":["perf:responsiveness"],"id":1732196},{"keywords":["perf:pageload"],"id":1733307,"priority":"P3","severity":"--","summary":"natursteine-rath.at - Very slow page load","status":"NEW","last_change_time":"2022-04-07T16:25:35Z","creation_time":"2021-09-30T05:53:05Z","op_sys":"Windows 10","component":"Performance"},{"summary":"Lichess chess playthrough is a bit slower in Firefox as compared to Chrome","severity":"S3","component":"Layout: Flexbox","op_sys":"Unspecified","creation_time":"2021-10-02T08:16:36Z","last_change_time":"2022-03-02T16:45:36Z","status":"NEW","id":1733763,"keywords":["perf:responsiveness"],"priority":"--"},{"creation_time":"2021-10-06T21:59:33Z","op_sys":"Android","component":"Performance","status":"NEW","last_change_time":"2022-06-26T21:50:02Z","summary":"Fenix loads fonts later than Chrome on aa.com.tr","severity":"--","priority":"P3","id":1734490,"keywords":["perf:pageload"]},{"keywords":["perf:responsiveness"],"id":1743481,"priority":"--","severity":"S4","summary":"Inconsistent vsync timings on Windows with some configurations (multiple monitors?)","last_change_time":"2022-04-07T15:20:22Z","status":"NEW","op_sys":"Windows 10","component":"Graphics","creation_time":"2021-11-29T20:10:27Z"},{"severity":"S3","summary":"high mem usage","last_change_time":"2022-09-12T15:24:36Z","status":"NEW","op_sys":"Unspecified","component":"Graphics: ImageLib","creation_time":"2021-12-27T04:39:34Z","keywords":["perf:resource-use"],"id":1747679,"priority":"P3"},{"keywords":["perf:responsiveness"],"id":1750463,"priority":"P3","severity":"S3","summary":"\"This page is slowing down your browser\" notifications cause resize events, which can hang slow-to-layout pages even more","last_change_time":"2022-02-15T17:27:51Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2022-01-16T21:38:52Z"},{"keywords":["perf:frontend","perf:responsiveness"],"id":1751459,"priority":"P3","severity":"S4","summary":"Use a lazy pref getter for the contile prefs in TopSitesFeed.jsm","status":"NEW","last_change_time":"2024-04-16T17:11:20Z","creation_time":"2022-01-21T18:06:43Z","op_sys":"All","component":"New Tab Page"},{"last_change_time":"2023-09-30T14:41:53Z","status":"NEW","component":"General","op_sys":"All","creation_time":"2022-02-03T01:17:31Z","severity":"S3","summary":"Script cache is not used on next process if a page load did not occur in the previous process","priority":"P3","keywords":["perf:startup"],"id":1753336},{"summary":"Site hangs for a long time on PWebGL or BHR?","severity":"S3","component":"Graphics: CanvasWebGL","op_sys":"Unspecified","creation_time":"2022-02-16T07:56:13Z","last_change_time":"2023-04-04T16:32:29Z","status":"NEW","id":1755632,"keywords":["perf"],"priority":"--"},{"last_change_time":"2024-11-27T09:16:20Z","status":"NEW","component":"XPCOM","op_sys":"Unspecified","creation_time":"2022-02-17T09:02:59Z","severity":"S4","summary":"Process using 100% of the CPU on the main thread recording infinite recursion error stacks","priority":"P3","keywords":["power","regression"],"id":1755864},{"status":"NEW","last_change_time":"2024-12-26T08:19:29Z","creation_time":"2022-02-20T20:25:36Z","op_sys":"Unspecified","component":"Tabbed Browser","severity":"N/A","summary":"Add mechanism to load large groups of tabs in smaller batches","priority":"P3","keywords":["perf:responsiveness","reproducible"],"id":1756368},{"priority":"--","id":1758582,"keywords":["perf:responsiveness"],"creation_time":"2022-03-08T22:18:44Z","op_sys":"Linux","component":"Graphics: WebRender","status":"NEW","last_change_time":"2023-03-06T00:31:56Z","summary":"The fancy apple product pages stutter heavily during scroll animation","severity":"S3"},{"id":1759112,"keywords":["perf:responsiveness"],"priority":"--","summary":"SnowWhiteKiller::~SnowWhiteKiller() is very visible in hang reports","severity":"S3","op_sys":"Unspecified","component":"XPCOM","creation_time":"2022-03-11T10:37:23Z","last_change_time":"2022-12-12T19:11:49Z","status":"NEW"},{"summary":"Slow drawing of this PDF file","severity":"S3","creation_time":"2022-03-28T09:34:21Z","component":"PDF Viewer","op_sys":"Unspecified","status":"NEW","last_change_time":"2022-12-08T17:11:00Z","id":1761734,"keywords":["perf:pageload","perf:responsiveness"],"priority":"P3"},{"summary":"FF91 and newer produce *huge* CPU-Load in certain situations","severity":"S3","creation_time":"2022-04-11T10:31:28Z","op_sys":"Unspecified","component":"Graphics: WebRender","status":"NEW","last_change_time":"2024-04-03T01:47:10Z","id":1764054,"keywords":["perf:resource-use"],"priority":"--"},{"id":1767129,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Jank when scrolling https://www.floatplane.com/channel/linustechtips/home","severity":"S3","component":"Web Painting","op_sys":"Linux","creation_time":"2022-04-30T04:10:02Z","last_change_time":"2022-05-24T03:22:26Z","status":"NEW"},{"priority":"P2","id":1768359,"keywords":["perf:resource-use","perf:responsiveness"],"op_sys":"Unspecified","component":"Graphics: Canvas2D","creation_time":"2022-05-08T07:05:02Z","last_change_time":"2022-09-09T07:18:52Z","status":"NEW","summary":"Scrolling through TurnitIn marking page spikes CPU to 20% and is incredibly slow","severity":"S4"},{"op_sys":"Linux","component":"Graphics: WebRender","creation_time":"2022-05-09T22:47:02Z","last_change_time":"2022-10-10T12:31:09Z","status":"NEW","summary":"CSS-Only Cube Pack has jank","severity":"S3","priority":"P3","id":1768552,"keywords":["perf","perf:responsiveness"]},{"component":"Audio/Video: Playback","op_sys":"Unspecified","creation_time":"2022-05-24T17:26:03Z","last_change_time":"2022-09-01T14:13:26Z","status":"NEW","summary":"Unnecessary power use to play soundless video below the fold","severity":"S3","priority":"P3","id":1770995,"keywords":["perf:resource-use","power"]},{"priority":"--","keywords":["perf:responsiveness"],"id":1771833,"last_change_time":"2022-10-29T03:04:49Z","status":"NEW","op_sys":"Linux","component":"Graphics: WebRender","creation_time":"2022-05-31T02:34:27Z","severity":"S4","summary":"Jank when opening menu on https://www.designpluspeace.com/"},{"creation_time":"2022-05-31T05:40:56Z","op_sys":"Linux","component":"Graphics: WebRender","status":"NEW","last_change_time":"2022-10-29T03:15:12Z","summary":"Jank when scrolling https://webflow.com/","severity":"S4","priority":"--","id":1771845,"keywords":["perf:responsiveness"]},{"id":1771846,"keywords":["perf:responsiveness"],"priority":"--","summary":"Jank when navigating https://www.euphoriques.com/","severity":"S4","creation_time":"2022-05-31T05:46:44Z","op_sys":"Linux","component":"Graphics: WebRender","status":"NEW","last_change_time":"2022-09-01T14:19:50Z"},{"id":1771991,"keywords":["perf:animation","top50"],"priority":"P3","summary":"Jank when opening hamburger menu on YouTube","severity":"S3","op_sys":"Linux","component":"Layout","creation_time":"2022-05-31T20:07:33Z","last_change_time":"2022-06-23T13:58:36Z","status":"NEW"},{"summary":"Slow game performance on jklm.fun","severity":"S3","creation_time":"2022-06-02T15:41:27Z","component":"Graphics: Canvas2D","op_sys":"Linux","status":"NEW","last_change_time":"2022-11-26T19:30:01Z","id":1772346,"keywords":["perf:animation","perf:responsiveness"],"priority":"--"},{"severity":"S3","summary":"GetLoadedModulesRunnable slow at shutdown","status":"NEW","last_change_time":"2022-11-01T12:46:28Z","creation_time":"2022-06-06T21:05:32Z","op_sys":"Windows","component":"Crash Reporting","keywords":[],"id":1772903,"priority":"--"},{"status":"NEW","last_change_time":"2024-12-30T06:56:32Z","creation_time":"2022-06-17T11:04:37Z","op_sys":"All","component":"Layout","severity":"S3","summary":"Viewing source of discourse.mozilla.org hangs indefinitely","priority":"--","keywords":["hang","perf:responsiveness","reproducible"],"id":1774775},{"priority":"--","keywords":["perf:animation","perf:responsiveness","reproducible"],"id":1786918,"last_change_time":"2023-06-02T21:02:27Z","status":"NEW","op_sys":"Unspecified","component":"Graphics: ImageLib","creation_time":"2022-08-24T17:23:13Z","severity":"S3","summary":"too much sync decoding of images on https://martyr.shop/products/sealed-bags"},{"summary":"When opening a window, the address bar changes size and moves from right to left, when (Extension) Overflow Button is visible on the Toolbar","severity":"S3","creation_time":"2022-09-26T15:12:15Z","op_sys":"All","component":"Toolbars and Customization","status":"NEW","last_change_time":"2022-10-31T10:55:26Z","id":1792449,"keywords":["perf:animation","reproducible"],"priority":"P3"},{"keywords":["perf:animation","perf:resource-use","perf:responsiveness","reproducible"],"id":1795684,"priority":"--","severity":"S3","summary":"BoomChicago.com booking interface slows down entire browser","status":"NEW","last_change_time":"2023-09-26T15:53:16Z","creation_time":"2022-10-17T13:07:09Z","component":"Graphics: WebRender","op_sys":"Unspecified"},{"id":1796080,"keywords":["regression"],"priority":"--","summary":"Timer initialization in BackgroundHangThread::NotifyActivity adds very high overhead to task handling","severity":"S3","creation_time":"2022-10-19T09:09:20Z","op_sys":"Unspecified","component":"XPCOM","status":"NEW","last_change_time":"2023-01-26T18:28:39Z"},{"priority":"--","keywords":["perf","perf:resource-use","power","reproducible"],"id":1804893,"last_change_time":"2024-04-08T16:37:18Z","status":"NEW","component":"Layout","op_sys":"Unspecified","creation_time":"2022-12-09T13:43:57Z","severity":"--","summary":">120% CPU load on https://web.arbeitsagentur.de/ausbildungssuche/ when scrolling through the page"},{"severity":"--","summary":"Firefox has 50% more soft page faults than Chrome running Speedometer 2","status":"NEW","last_change_time":"2024-11-15T18:04:48Z","creation_time":"2022-12-12T19:01:50Z","op_sys":"Unspecified","component":"Performance","keywords":[],"id":1805255,"priority":"--"},{"priority":"P3","id":1805460,"keywords":[],"creation_time":"2022-12-13T16:24:36Z","op_sys":"Unspecified","component":"New Tab Page","status":"NEW","last_change_time":"2023-06-05T23:18:33Z","summary":"The memory used by the Privileged Content process increases by about 5MB every 5 minutes","severity":"S3"},{"id":1805999,"keywords":[],"priority":"--","summary":"Higher GPU usage in Google Meet than in Chrome","severity":"S3","creation_time":"2022-12-15T21:11:40Z","op_sys":"Unspecified","component":"Graphics: WebRender","status":"NEW","last_change_time":"2024-04-03T00:48:35Z"},{"keywords":["perf","perf:startup","reproducible"],"id":1807070,"priority":"P3","severity":"--","summary":"[Snap] nsIShellService.isDefaultBrowser is slow and called 3 times during startup","status":"NEW","last_change_time":"2023-07-11T17:17:27Z","creation_time":"2022-12-22T19:36:30Z","op_sys":"Linux","component":"Widget: Gtk"},{"priority":"P5","id":1807310,"keywords":[],"op_sys":"Android","component":"Performance","creation_time":"2022-12-23T20:41:16Z","last_change_time":"2025-01-02T09:46:16Z","status":"NEW","summary":"Don't reinit fragments and reinflate layouts to reduce power usage","severity":"S2"},{"summary":"Avoid multiple layouts to improve power usage caused by suspending observer updates","severity":"S3","component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:41:24Z","last_change_time":"2023-12-05T19:40:48Z","status":"NEW","id":1807311,"keywords":[],"priority":"P3"},{"component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:41:46Z","last_change_time":"2023-12-05T21:58:33Z","status":"NEW","summary":"Gecko resizes when keyboard dismissed by tapping the page","severity":"S3","priority":"--","id":1807312,"keywords":[]},{"creation_time":"2022-12-23T20:41:53Z","op_sys":"Android","component":"Performance","status":"NEW","last_change_time":"2023-12-05T21:58:55Z","summary":"Performance experiment: create the speculative gecko session sooner to improve applink (view) startup","severity":"S3","priority":"--","id":1807313,"keywords":[]},{"id":1807315,"keywords":[],"priority":"P4","summary":"On start up, ensure first network request is page load","severity":"S3","component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:42:15Z","last_change_time":"2023-12-05T19:32:23Z","status":"NEW"},{"id":1807316,"keywords":[],"priority":"--","summary":"The speculative gecko session does not appear to be created prior to the WARM VIEW scenario","severity":"S3","component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:43:00Z","last_change_time":"2023-12-05T21:59:07Z","status":"NEW"},{"priority":"--","keywords":[],"id":1807323,"last_change_time":"2023-12-05T22:00:52Z","status":"NEW","component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:44:16Z","severity":"S3","summary":"Up to 8 network requests occur before target url in COLD VIEW start up"},{"priority":"--","id":1807328,"keywords":[],"creation_time":"2022-12-23T20:44:53Z","component":"Performance","op_sys":"Android","status":"NEW","last_change_time":"2023-12-05T22:01:26Z","summary":"Opening homescreen shortcuts takes noticeably longer than opening the app icon","severity":"S3"},{"id":1807329,"keywords":[],"priority":"--","summary":"Scrolling renders at 60 fps on a 90 Hz displays with Nightly (and Focus)","severity":"S3","component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:45:05Z","last_change_time":"2025-01-02T09:48:30Z","status":"NEW"},{"id":1807337,"keywords":[],"priority":"--","summary":"Taking a screenshot on the main thread delays tabs tray from opening for ~178ms","severity":"S3","creation_time":"2022-12-23T20:47:41Z","op_sys":"Android","component":"Performance","status":"NEW","last_change_time":"2023-12-05T22:05:49Z"},{"summary":"260-524ms between HomeActivity.load and GeckoSession.load when entered hitting enter on search","severity":"S3","creation_time":"2022-12-23T20:47:51Z","op_sys":"Android","component":"Performance","status":"NEW","last_change_time":"2023-12-05T22:06:11Z","id":1807338,"keywords":[],"priority":"--"},{"priority":"--","id":1807341,"keywords":[],"component":"Performance","op_sys":"Android","creation_time":"2022-12-23T20:49:08Z","last_change_time":"2023-12-05T22:07:04Z","status":"NEW","summary":"Search suggestions block 64-130ms on UI transitions before fetching when typing characters in the awesome screen","severity":"S3"},{"id":1807343,"keywords":[],"priority":"P2","summary":"`SuggestionFetcher.fetch` is called on empty text when url bar is pressed","severity":"S3","op_sys":"Android","component":"Performance","creation_time":"2022-12-23T20:49:33Z","last_change_time":"2023-12-05T22:08:07Z","status":"NEW"},{"keywords":[],"id":1807344,"priority":"--","severity":"S4","summary":"2s+ between hitting PWA app icon and displaying an content (white screen) from the app","last_change_time":"2024-08-30T17:46:41Z","status":"NEW","op_sys":"Android","component":"Performance","creation_time":"2022-12-23T20:49:47Z"},{"last_change_time":"2024-04-17T19:37:32Z","status":"NEW","op_sys":"Android","component":"Search","creation_time":"2022-12-27T21:12:56Z","severity":"S4","summary":"Editing a custom search engine has slow response on Save","priority":"P5","keywords":["perf:responsiveness","reproducible"],"id":1807708},{"id":1810370,"keywords":["perf:pageload","perf:resource-use"],"priority":"--","summary":"Focus gives a \"running in the background\" notification in Task Switcher and uses lots of CPU in background","severity":"S3","op_sys":"Android","component":"General","creation_time":"2023-01-15T17:00:52Z","last_change_time":"2024-03-27T00:27:50Z","status":"NEW"},{"component":"Performance","op_sys":"Android","creation_time":"2023-01-27T23:26:43Z","last_change_time":"2023-12-05T22:16:45Z","status":"NEW","summary":"Glean code adds ~61ms on COLD start up, all types","severity":"S3","priority":"--","id":1813248,"keywords":[]},{"priority":"--","id":1813710,"keywords":[],"op_sys":"Android","component":"Performance","creation_time":"2023-01-30T19:47:21Z","last_change_time":"2025-01-02T09:59:33Z","status":"NEW","summary":"Firefox does not load any site for few seconds after switching back and forth between apps","severity":"S3"},{"priority":"P3","keywords":[],"id":1814129,"last_change_time":"2024-01-12T02:46:42Z","status":"NEW","op_sys":"Android","component":"Performance","creation_time":"2023-01-31T16:24:00Z","severity":"S4","summary":"Debug build crashes at startup on older devices"},{"severity":"S3","summary":"WorkerNavigator::GetUserAgent does a sync-loop call to the main thread","status":"NEW","last_change_time":"2024-11-08T19:53:32Z","creation_time":"2023-02-14T12:25:02Z","component":"DOM: Workers","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1816657,"priority":"P3"},{"summary":"[meta] Determine what improvements we can make to our use and measurement of speculative connect","severity":"N/A","op_sys":"All","component":"Performance","creation_time":"2023-02-14T14:05:00Z","last_change_time":"2024-07-31T19:51:50Z","status":"NEW","id":1816678,"keywords":["meta"],"priority":"P2"},{"summary":"Jank when grabbing and dragging carousel","severity":"S3","component":"Graphics: WebRender","op_sys":"Linux","creation_time":"2023-02-23T01:36:24Z","last_change_time":"2024-04-03T02:33:21Z","status":"NEW","id":1818402,"keywords":["perf:animation","perf:responsiveness"],"priority":"P3"},{"keywords":[],"id":1818835,"priority":"--","severity":"--","summary":"Enhancement with Huawei and some hardware.","last_change_time":"2024-11-09T14:11:50Z","status":"NEW","component":"Performance","op_sys":"Android","creation_time":"2023-02-24T22:56:53Z"},{"priority":"--","keywords":["perf:resource-use"],"id":1820840,"last_change_time":"2023-03-09T18:16:26Z","status":"NEW","component":"Performance","op_sys":"macOS","creation_time":"2023-03-07T18:19:18Z","severity":"--","summary":"High CPU/GPU usage on website https://openbb.co/"},{"last_change_time":"2024-12-06T16:24:56Z","status":"NEW","op_sys":"Unspecified","component":"Networking: HTTP","creation_time":"2023-03-10T15:27:13Z","severity":"N/A","summary":"Cancel remaining timers when http connections are all resolved","priority":"P3","keywords":["perf:resource-use"],"id":1821691},{"creation_time":"2023-03-24T10:37:54Z","op_sys":"Unspecified","component":"Performance","status":"NEW","last_change_time":"2023-04-27T20:34:40Z","summary":"Memory Leak (Isolated Web Container)","severity":"--","priority":"--","id":1824332,"keywords":[]},{"priority":"P3","keywords":["perf"],"id":1824872,"last_change_time":"2024-03-19T12:32:00Z","status":"NEW","component":"Places","op_sys":"Unspecified","creation_time":"2023-03-28T00:04:31Z","severity":"S3","summary":"Firefox takes much longer to complete a history-deletion operation, if the user presses and holds `Del` key (instead of pressing once), with lots of history entries selected"},{"priority":"--","id":1825084,"keywords":["nightly-community","perf:responsiveness","reproducible"],"component":"Performance","op_sys":"Unspecified","creation_time":"2023-03-28T18:35:07Z","last_change_time":"2023-04-19T13:58:43Z","status":"NEW","summary":"flightaware.com page becomes insensitive to user input/links cannot be navigated to when loading","severity":"S3"},{"summary":"Very high memory usage on Zenni Optical's website","severity":"--","creation_time":"2023-05-05T03:49:37Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2023-05-27T01:22:58Z","id":1831458,"keywords":["perf:animation","perf:resource-use"],"priority":"--"},{"priority":"--","keywords":["perf:responsiveness"],"id":1831609,"status":"NEW","last_change_time":"2024-02-21T08:39:22Z","creation_time":"2023-05-05T16:47:25Z","component":"Graphics: Canvas2D","op_sys":"macOS","severity":"S3","summary":"Canvas drawing outside requestAnimationFrame callbacks leads to overproduction (needs more backpressure) - paints become slower and slower"},{"priority":"--","id":1833620,"keywords":["perf:animation","perf:responsiveness"],"component":"Graphics: Canvas2D","op_sys":"Linux","creation_time":"2023-05-17T12:21:40Z","last_change_time":"2023-08-05T00:48:45Z","status":"NEW","summary":"sinerider.com is slow","severity":"S4"},{"op_sys":"All","component":"Add-ons Manager","creation_time":"2023-05-18T09:10:01Z","last_change_time":"2024-01-29T21:54:50Z","status":"NEW","summary":"In automation, add-on manager in msix builds spend ~400ms or more on startup doing mainthread IO `stat` calls on every language pack we ship to get the last modified date of all of them (and then uninstalls all of them!?)","severity":"N/A","priority":"P3","id":1833831,"keywords":["main-thread-io","perf:startup","reproducible"]},{"priority":"P3","id":1834526,"keywords":["perf:resource-use","perf:responsiveness","regression","reproducible"],"creation_time":"2023-05-23T13:01:29Z","op_sys":"Unspecified","component":"JavaScript: GC","status":"NEW","last_change_time":"2024-12-31T18:44:37Z","summary":"Large fetch in Web Worker in extension causes hang in Firefox extension process","severity":"S3"},{"op_sys":"Android","component":"General","creation_time":"2023-05-24T08:10:15Z","last_change_time":"2024-05-14T21:29:08Z","status":"NEW","summary":"www.boredpanda.com - Homescreen app is laggy when installed to the home screen","severity":"S3","priority":"P3","id":1834706,"keywords":["perf:pageload","perf:resource-use","perf:responsiveness","reproducible"]},{"keywords":[],"id":1834720,"priority":"--","severity":"--","summary":"Address bar is slow on Android (compared to Chrome)","status":"NEW","last_change_time":"2023-06-23T20:26:51Z","creation_time":"2023-05-24T09:20:14Z","component":"Performance","op_sys":"Android"},{"id":1836300,"keywords":["perf:responsiveness"],"priority":"P3","summary":"CPU spike when new tab page has many rows of icons","severity":"S3","creation_time":"2023-06-01T15:17:18Z","component":"New Tab Page","op_sys":"Unspecified","status":"NEW","last_change_time":"2023-06-09T14:24:13Z"},{"status":"NEW","last_change_time":"2024-09-01T18:54:49Z","creation_time":"2023-06-09T01:17:11Z","op_sys":"Linux","component":"Audio/Video: Playback","severity":"S3","summary":"KDE X11/Mesa 23.1.1/Radeon RX 580: 5GB memory leak (heap-unclassified) in RDD process when scrolling on Youtube Shorts","priority":"--","keywords":["memory-leak","perf:resource-use"],"id":1837553},{"severity":"S3","summary":"Jank when a window with many tabs becomes active/inactive, due to restyling all the tabs to account for GTK-theme-imposed tab-title text color change (e.g. grayed-out text for inactive window)","status":"NEW","last_change_time":"2023-07-01T10:07:59Z","creation_time":"2023-06-11T19:24:03Z","op_sys":"Linux","component":"Widget: Gtk","keywords":["perf:responsiveness","reproducible"],"id":1837871,"priority":"--"},{"status":"NEW","last_change_time":"2023-06-29T18:57:04Z","creation_time":"2023-06-13T04:59:19Z","op_sys":"Unspecified","component":"Graphics: Canvas2D","severity":"S4","summary":"canvas demo (https://www.fxhash.xyz/generative/slug/whispering-depths) is slower with gpu-canvas compared to skia-canvas","priority":"--","keywords":["perf:animation","perf:responsiveness"],"id":1838135},{"priority":"--","id":1838448,"keywords":["perf:resource-use","perf:responsiveness","regression"],"creation_time":"2023-06-14T14:37:10Z","op_sys":"Unspecified","component":"Storage","status":"NEW","last_change_time":"2024-10-08T13:29:24Z","summary":"CPU usage in StructuredCloneHolder.deserialize starting version 115 far higher than in 114 with Dashlane extension","severity":"S3"},{"keywords":["perf:pageload","perf:resource-use","perf:responsiveness"],"id":1839322,"priority":"P2","severity":"S3","summary":"TransmitPermissionsAndBlobURLsForPrincipalInfo blocks the main thread","last_change_time":"2023-06-29T18:45:39Z","status":"NEW","op_sys":"Unspecified","component":"DOM: File","creation_time":"2023-06-20T08:58:55Z"},{"summary":"Loading a testcase with 1000 css files is 2x faster on Chrome compared to Nightly","severity":"--","op_sys":"Unspecified","component":"CSS Parsing and Computation","creation_time":"2023-06-27T16:52:12Z","last_change_time":"2024-10-02T17:31:08Z","status":"NEW","id":1840656,"keywords":["perf:pageload"],"priority":"--"},{"id":1841207,"keywords":["perf"],"priority":"P3","summary":"The download button is unresponsive while saving a HTML page with 4000 CSS files","severity":"S3","op_sys":"Unspecified","component":"File Handling","creation_time":"2023-06-30T03:07:23Z","last_change_time":"2023-07-28T16:54:46Z","status":"NEW"},{"keywords":["perf:resource-use"],"id":1842079,"priority":"P3","severity":"N/A","summary":"Three seconds of CPU work during startup in mozilla::safebrowsing::ProtocolParserProtobuf::ProcessEncodedAddition and mozilla::safebrowsing::Classifier::UpdateTableV4","last_change_time":"2024-04-17T10:46:30Z","status":"NEW","component":"Safe Browsing","op_sys":"All","creation_time":"2023-07-06T20:07:26Z"},{"severity":"--","summary":"Huge memory and CPU usage on https://jp.mercari.com/","last_change_time":"2023-07-28T16:14:31Z","status":"NEW","op_sys":"Windows 10","component":"Performance","creation_time":"2023-07-17T03:51:04Z","keywords":["nightly-community"],"id":1843821,"priority":"P4"},{"keywords":["perf:resource-use"],"id":1846333,"priority":"--","severity":"--","summary":"Animated clouds on http://www.wdrmaus.de use around 60% CPU and GPU load","status":"NEW","last_change_time":"2023-12-04T12:25:36Z","creation_time":"2023-07-31T19:26:23Z","component":"Performance","op_sys":"Unspecified"},{"priority":"--","id":1848647,"keywords":["perf:resource-use"],"op_sys":"Windows 11","component":"CSS Transitions and Animations","creation_time":"2023-08-14T14:59:01Z","last_change_time":"2024-09-15T00:58:55Z","status":"NEW","summary":"Closing a background tab with CSS OMTA animations can lead to GPU process continuously doing OMTA stuff, leading to stutter and increased power use","severity":"S3"},{"creation_time":"2023-09-08T19:13:50Z","component":"Browser Engine","op_sys":"All","status":"NEW","last_change_time":"2024-05-06T18:44:26Z","summary":"parallax page lags out browser and scrolling","severity":"S3","priority":"--","id":1852332,"keywords":["perf:responsiveness"]},{"priority":"P3","keywords":["perf"],"id":1854770,"last_change_time":"2024-10-29T13:40:36Z","status":"NEW","op_sys":"Unspecified","component":"Places","creation_time":"2023-09-23T05:17:21Z","severity":"S3","summary":"Hangs on pages with huge (many thousands) number of links, mostly due to building large IPC messages and HashSets"},{"summary":"PDF https://test.biblestudy.tools/PDF/Self-Pronouncing/8.5x11/12pt/Prefatory-Note.pdf Very Slow in PC","severity":"S3","component":"PDF Viewer","op_sys":"Unspecified","creation_time":"2023-09-30T16:27:57Z","last_change_time":"2023-10-05T17:01:02Z","status":"NEW","id":1856168,"keywords":["perf"],"priority":"--"},{"op_sys":"Windows 10","component":"Audio/Video","creation_time":"2023-11-10T13:16:24Z","last_change_time":"2024-05-15T19:05:08Z","status":"NEW","summary":"Higher RAM usage compared to Chrome when a background video trailer plays at hulu.com","severity":"--","priority":"P3","id":1864166,"keywords":["perf:resource-use"]},{"summary":"60% CPU usage of content process because of memory leak in gc-heap on Amazon product page","severity":"--","creation_time":"2023-11-28T16:56:15Z","op_sys":"Unspecified","component":"Performance","status":"NEW","last_change_time":"2024-06-28T12:15:03Z","id":1867074,"keywords":["perf:resource-use"],"priority":"--"},{"severity":"--","summary":"Memory leak and high CPU consumption at marketwatch.com","last_change_time":"2024-05-06T16:23:39Z","status":"NEW","op_sys":"Windows 10","component":"Performance","creation_time":"2023-12-06T19:59:29Z","keywords":["perf:resource-use"],"id":1868643,"priority":"--"},{"severity":"S3","summary":"Infinte recursing when selecting text on cbtnuggets.com","status":"NEW","last_change_time":"2024-06-20T12:30:12Z","creation_time":"2023-12-13T01:02:22Z","component":"Site Reports","op_sys":"Unspecified","keywords":["perf:responsiveness","reproducible","webcompat:needs-diagnosis"],"id":1869680,"priority":"P3"},{"summary":"High resource usage during video playback on hyprland.org","severity":"S3","creation_time":"2024-01-03T23:54:42Z","op_sys":"Windows","component":"Graphics: WebRender","status":"NEW","last_change_time":"2024-04-02T20:48:12Z","id":1872944,"keywords":[],"priority":"--"},{"summary":"Rapid memory increase on a demo that continues  after you stop the demo, and profile shows 8s hang in content process and 1s in parent process","severity":"--","creation_time":"2024-01-12T03:30:23Z","component":"Performance","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-10-08T17:35:03Z","id":1874342,"keywords":[],"priority":"--"},{"priority":"P3","id":1875547,"keywords":["perf"],"op_sys":"Unspecified","component":"PDF Viewer","creation_time":"2024-01-19T22:07:59Z","last_change_time":"2024-11-09T13:54:50Z","status":"NEW","summary":"Slow (single-threaded) PDF rendering for documents with lots of vector shapes","severity":"S3"},{"status":"NEW","last_change_time":"2024-06-20T00:46:02Z","creation_time":"2024-02-01T20:24:40Z","op_sys":"All","component":"Graphics: Canvas2D","severity":"S3","summary":"PDF takes excessively long to render with hardware acceleration enabled","priority":"--","keywords":["perf:pageload","reproducible"],"id":1878133},{"id":1879269,"keywords":["perf:responsiveness"],"priority":"--","summary":"Slow animation and scrolling on multiplayer.it","severity":"S3","creation_time":"2024-02-08T08:43:31Z","op_sys":"Unspecified","component":"Graphics","status":"NEW","last_change_time":"2024-05-09T16:23:37Z"},{"priority":"P3","id":1880744,"keywords":["perf:animation","perf:responsiveness"],"creation_time":"2024-02-18T07:26:44Z","component":"Netmonitor","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-09-25T11:00:38Z","summary":"Leaving devtools (netmonitor) open in a background tab janks the parent process main thread","severity":"S3"},{"last_change_time":"2024-10-03T00:34:06Z","status":"NEW","component":"Graphics","op_sys":"Windows","creation_time":"2024-02-19T09:20:23Z","severity":"S3","summary":"Tab preview from dragging appears to use software rendering and blocks both content-process and parent process","priority":"P2","keywords":[],"id":1880794},{"priority":"--","keywords":["perf:responsiveness"],"id":1881248,"status":"NEW","last_change_time":"2024-04-29T17:59:45Z","creation_time":"2024-02-21T13:57:16Z","component":"Performance","op_sys":"macOS","severity":"--","summary":"Don't show drag and drop previews for very large images"},{"keywords":["perf:animation","perf:responsiveness"],"id":1881384,"priority":"P2","severity":"S3","summary":"Very low framerate on https://www.mozilla.ai/ when at the top of the page","last_change_time":"2024-05-09T17:04:46Z","status":"NEW","component":"Graphics","op_sys":"Unspecified","creation_time":"2024-02-22T02:13:59Z"},{"summary":"Demo that takes png snapshots of canvas and saves to disk (using large data URIs), takes considerable amount of time on parent process","severity":"S3","op_sys":"Windows","component":"Downloads API","creation_time":"2024-02-29T06:52:29Z","last_change_time":"2024-10-11T07:09:25Z","status":"NEW","id":1882699,"keywords":["perf:responsiveness"],"priority":"P3"},{"status":"NEW","last_change_time":"2024-06-06T11:10:59Z","creation_time":"2024-03-22T18:58:09Z","component":"Performance","op_sys":"Android","severity":"S3","summary":"Slow responses on trivia game in Fenix Nightly vs. Chrome on same device & network connection","priority":"P3","keywords":[],"id":1887129},{"summary":"URL.searchParams performance issue","severity":"N/A","op_sys":"Unspecified","component":"DOM: Networking","creation_time":"2024-03-26T22:56:35Z","last_change_time":"2024-04-23T14:52:50Z","status":"NEW","id":1887997,"keywords":[],"priority":"P3"},{"id":1889445,"keywords":["perf:frontend"],"priority":"P3","summary":"The font dialog flickers when it is initially populated","severity":"S4","op_sys":"Unspecified","component":"Settings UI","creation_time":"2024-04-03T17:52:02Z","last_change_time":"2024-04-04T16:36:59Z","status":"NEW"},{"priority":"P2","keywords":["perf:resource-use"],"id":1889621,"status":"NEW","last_change_time":"2025-01-02T10:03:46Z","creation_time":"2024-04-04T13:05:56Z","component":"Networking: HTTP","op_sys":"Unspecified","severity":"S3","summary":"A repeating 1h \"nsHttpConnectionMgr\" timer fires while GeckoView example is completely idle"},{"severity":"S3","summary":"Fenix restarts itself soon after getting killed by the user","last_change_time":"2025-01-02T10:03:17Z","status":"NEW","component":"Performance","op_sys":"Android","creation_time":"2024-04-04T13:57:40Z","keywords":["perf:resource-use"],"id":1889648,"priority":"--"},{"keywords":["perf:animation","regression"],"id":1892367,"priority":"P2","severity":"S3","summary":"3%-5% regression on multiple AWFY-SP2 benchmark suites around 17Apr2024 (mostly on todo-mvc-Deleting- XXXX type benchmarks)","last_change_time":"2024-06-12T08:12:07Z","status":"NEW","op_sys":"Unspecified","component":"Performance","creation_time":"2024-04-19T02:36:20Z"},{"keywords":["perf:animation","perf:responsiveness"],"id":1892850,"priority":"P3","severity":"--","summary":"Bug Report - Scrolling lags on about:preferences in Firefox Snap (lubuntu 24.04 alpha)","status":"NEW","last_change_time":"2024-10-01T10:35:18Z","creation_time":"2024-04-23T01:05:15Z","op_sys":"Linux","component":"Widget: Gtk"},{"summary":"Massive jank when scrolling https://frontendmasters.com/blog/the-view-transition-api/","severity":"S3","creation_time":"2024-04-28T22:34:26Z","component":"Graphics: WebRender","op_sys":"Linux","status":"NEW","last_change_time":"2024-05-22T17:44:03Z","id":1893904,"keywords":["perf:animation","perf:responsiveness"],"priority":"--"},{"last_change_time":"2024-06-07T12:07:45Z","status":"NEW","component":"Toolbars and Customization","op_sys":"Unspecified","creation_time":"2024-04-30T10:03:38Z","severity":"S3","summary":"Tab switches to/from tabs with tab-specific infobars cause viewport height to change, resulting in layout jank","priority":"P3","keywords":["perf","perf:responsiveness","regression","reproducible"],"id":1894194},{"last_change_time":"2024-06-27T18:34:28Z","status":"NEW","op_sys":"Unspecified","component":"Audio/Video","creation_time":"2024-06-03T02:10:03Z","severity":"S3","summary":"Higher CPU use than Chrome on twitch.tv","priority":"--","keywords":["perf:resource-use","top50"],"id":1900288},{"summary":"unloadNonRequiredTabs/this.unloadTimer<[AsyncTabSwitcher.sys.mjs]:JS fires every 300ms","severity":"S4","component":"Tabbed Browser","op_sys":"Unspecified","creation_time":"2024-06-06T11:30:10Z","last_change_time":"2024-06-19T12:33:29Z","status":"NEW","id":1900989,"keywords":[],"priority":"P3"},{"priority":"--","keywords":["perf:responsiveness"],"id":1902812,"status":"NEW","last_change_time":"2024-07-12T08:33:44Z","creation_time":"2024-06-15T03:51:42Z","component":"Graphics: WebRender","op_sys":"Linux","severity":"S3","summary":"Jank when scrolling article"},{"status":"NEW","last_change_time":"2024-09-06T04:01:38Z","creation_time":"2024-07-12T09:47:06Z","op_sys":"Unspecified","component":"Performance","severity":"S3","summary":"Unable to re-arrange tabs while unzipping files using the drag and drop feature","priority":"--","keywords":[],"id":1907530},{"severity":"S3","summary":"www.syncfusion.com - High CPU and memory usage with zoom set to 110% when opening links in new tabs","status":"NEW","last_change_time":"2024-07-29T13:43:40Z","creation_time":"2024-07-26T12:27:37Z","component":"Performance","op_sys":"Windows 10","keywords":["perf:resource-use"],"id":1910093,"priority":"P3"},{"priority":"P3","keywords":["perf:responsiveness","reproducible"],"id":1917293,"status":"NEW","last_change_time":"2024-12-17T18:53:47Z","creation_time":"2024-09-06T15:23:08Z","component":"JavaScript Engine: JIT","op_sys":"Linux","severity":"S3","summary":"High CPU usage on xiaohongshu.com, page slow warning"},{"severity":"--","summary":"controld.com - Blank section for a few seconds when scrolling past \"Standard Configurations\"","status":"NEW","last_change_time":"2024-12-24T12:09:18Z","creation_time":"2024-09-10T07:53:03Z","op_sys":"Android","component":"Graphics: WebRender","keywords":["perf:responsiveness","reproducible"],"id":1917774,"priority":"--"},{"keywords":["perf:responsiveness"],"id":1922769,"priority":"P3","severity":"S3","summary":"chrconnect.telushealth.com - Navigation on the page is laggy/slow, readback during createImageBitmap","status":"NEW","last_change_time":"2024-10-29T01:00:16Z","creation_time":"2024-10-04T10:45:32Z","op_sys":"Windows 10","component":"Graphics: Canvas2D"},{"id":1924193,"keywords":["perf","reproducible"],"priority":"P3","summary":"Scrolling in vertical tabs is super slow and janky","severity":"S3","creation_time":"2024-10-11T19:43:04Z","component":"Tabbed Browser","op_sys":"Unspecified","status":"NEW","last_change_time":"2024-12-31T18:25:52Z"},{"priority":"--","id":1925271,"keywords":["webcompat:site-report"],"creation_time":"2024-10-17T12:58:07Z","op_sys":"Windows 10","component":"JavaScript Engine","status":"NEW","last_change_time":"2024-12-26T13:32:31Z","summary":"eaglercraftx1-8.github.io - Game is lagging","severity":"--"},{"severity":"--","summary":"etoland.co.kr - Page elements take longer to load","status":"NEW","last_change_time":"2024-12-26T13:36:18Z","creation_time":"2024-10-24T14:01:03Z","component":"Performance","op_sys":"Windows 10","keywords":[],"id":1926871,"priority":"--"},{"priority":"P3","keywords":[],"id":1927084,"status":"NEW","last_change_time":"2024-12-26T13:52:49Z","creation_time":"2024-10-25T09:55:43Z","op_sys":"Windows 10","component":"Graphics: Canvas2D","severity":"S3","summary":"map.epfl.ch - Laggy when trying to navigate on the map"},{"severity":"--","summary":"Jira button animations cause sustained high Firefox CPU usage","status":"NEW","last_change_time":"2024-12-26T14:15:47Z","creation_time":"2024-11-05T23:33:58Z","op_sys":"Unspecified","component":"Graphics: WebRender","keywords":[],"id":1929443,"priority":"--"},{"priority":"--","id":1236104,"keywords":["perf"],"creation_time":"2015-12-31T22:36:47Z","component":"JavaScript Engine","op_sys":"Unspecified","status":"REOPENED","last_change_time":"2024-11-10T14:48:32Z","summary":"Allow scripts from pre-load cache to be off-thread compiled.","severity":"S3"},{"severity":"S3","summary":"Yield to painting during GC","status":"REOPENED","last_change_time":"2023-08-05T00:12:47Z","creation_time":"2016-10-05T23:40:26Z","component":"JavaScript: GC","op_sys":"Unspecified","keywords":["perf:responsiveness","triage-deferred"],"id":1308039,"priority":"P3"},{"priority":"P3","id":1329923,"keywords":["perf","stale-bug"],"component":"JavaScript Engine: JIT","op_sys":"All","creation_time":"2017-01-10T08:53:07Z","last_change_time":"2022-10-11T18:54:40Z","status":"REOPENED","summary":"Emit profiler markers for discarding Ion code","severity":"S3"},{"component":"JavaScript Engine","op_sys":"Unspecified","creation_time":"2017-02-22T22:49:06Z","last_change_time":"2022-10-11T19:02:27Z","status":"REOPENED","summary":"WriteStructuredClone can be slow on Google Drive","severity":"S3","priority":"P3","id":1341900,"keywords":["perf"]},{"status":"REOPENED","last_change_time":"2022-10-11T19:13:44Z","creation_time":"2017-04-22T23:30:21Z","component":"Add-ons Manager","op_sys":"Unspecified","severity":"S3","summary":"0.99ms uninterruptible reflow at loadViewInternal@chrome://mozapps/content/extensions/extensions.js:932:5","priority":"P3","keywords":[],"id":1358829},{"priority":"P3","keywords":["perf","perf:startup"],"id":1358927,"last_change_time":"2024-04-16T17:03:09Z","status":"REOPENED","component":"Graphics","op_sys":"Unspecified","creation_time":"2017-04-23T21:46:03Z","severity":"S3","summary":"Initializing gfxPlatform to get telemetry data is quite slow"},{"summary":"Google Search profile","severity":"S3","component":"JavaScript Engine","op_sys":"Windows 10","creation_time":"2017-06-09T14:01:35Z","last_change_time":"2022-10-11T19:22:21Z","status":"REOPENED","id":1371659,"keywords":["perf"],"priority":"P3"},{"id":1381387,"keywords":["perf"],"priority":"P3","summary":"Performance analysis on gmail_ail_reply_mail","severity":"S3","op_sys":"Windows 10","component":"JavaScript Engine","creation_time":"2017-07-17T05:59:34Z","last_change_time":"2022-10-11T19:29:34Z","status":"REOPENED"},{"id":1419502,"keywords":["perf"],"priority":"P3","summary":"Specific PDF  page takes 10s to render (200% cpu)","severity":"S3","op_sys":"Unspecified","component":"PDF Viewer","creation_time":"2017-11-21T18:29:09Z","last_change_time":"2024-05-02T16:06:44Z","status":"REOPENED"},{"component":"Performance","op_sys":"Unspecified","creation_time":"2021-03-03T14:22:56Z","last_change_time":"2023-01-27T13:29:46Z","status":"REOPENED","summary":"Navigation on YouTube and YouTube Music gets CPU to 100%","severity":"--","priority":"P3","id":1696171,"keywords":["perf:responsiveness"]},{"priority":"P3","keywords":["perf:resource-use"],"id":1732049,"status":"REOPENED","last_change_time":"2024-02-19T10:26:10Z","creation_time":"2021-09-22T12:23:30Z","op_sys":"Unspecified","component":"JavaScript Engine","severity":"S4","summary":"Slow animation when using Mapbox GL"},{"summary":"Memory spike when closing 200-300 tabs at once","severity":"S3","component":"Performance","op_sys":"Linux","creation_time":"2021-11-29T08:14:36Z","last_change_time":"2024-11-28T06:00:16Z","status":"REOPENED","id":1743351,"keywords":[],"priority":"P3"},{"severity":"S3","summary":"`ResourceCommand`'s `_cache` can grow indefinitely","status":"REOPENED","last_change_time":"2022-05-20T19:15:44Z","creation_time":"2022-03-25T20:11:57Z","component":"General","op_sys":"Unspecified","keywords":["perf:resource-use","perf:responsiveness"],"id":1761554,"priority":"P2"},{"keywords":["perf:startup"],"id":1789850,"priority":"P3","severity":"S3","summary":"Reduce first-startup.timeout from 30 seconds to something reasonable","status":"REOPENED","last_change_time":"2024-03-14T23:29:50Z","creation_time":"2022-09-08T14:43:03Z","op_sys":"All","component":"Installer"},{"status":"REOPENED","last_change_time":"2024-09-24T19:07:50Z","creation_time":"2023-03-21T16:04:41Z","component":"General","op_sys":"Unspecified","severity":"S3","summary":"parent process can consume many GB of memory if google document active","priority":"P2","keywords":["perf:resource-use","perf:responsiveness","top50"],"id":1823729},{"priority":"P2","keywords":[],"id":1904284,"status":"REOPENED","last_change_time":"2025-01-02T09:55:13Z","creation_time":"2024-06-24T06:45:35Z","op_sys":"Unspecified","component":"Networking","severity":"S3","summary":"Opening https://colorjs.io/ keeps the parent-process very busy for 4+seconds, spending  tons of time in network-y IPC. This results in stutter while scrolling"},{"keywords":["leave-open","webcompat:needs-diagnosis","webcompat:site-report"],"id":1927053,"priority":"P3","severity":"S3","summary":"e.issuu.com - Magazine pages are not fully loaded and navigation is laggy","status":"REOPENED","last_change_time":"2024-12-26T13:50:00Z","creation_time":"2024-10-25T08:16:00Z","op_sys":"Windows 10","component":"Graphics: Canvas2D"},{"severity":"S3","summary":"high number of events /s reported by powertop when idle","last_change_time":"2024-07-18T15:42:44Z","status":"UNCONFIRMED","op_sys":"Linux","component":"Performance","creation_time":"2013-02-27T06:06:20Z","keywords":["perf:resource-use"],"id":845677,"priority":"--"},{"last_change_time":"2022-10-11T18:04:53Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Layout","creation_time":"2016-03-03T20:31:22Z","severity":"S3","summary":"jquery performance increases if the page is displayed in a iframe","priority":"--","keywords":["perf"],"id":1253394},{"severity":"S3","summary":"Object.keys 50% slower than for...in","status":"UNCONFIRMED","last_change_time":"2023-04-11T19:49:42Z","creation_time":"2016-04-20T17:12:27Z","component":"JavaScript Engine","op_sys":"Unspecified","keywords":[],"id":1266140,"priority":"P3"},{"priority":"P3","id":1329486,"keywords":["perf"],"component":"Networking","op_sys":"Windows 10","creation_time":"2017-01-08T13:10:12Z","last_change_time":"2023-04-12T12:37:21Z","status":"UNCONFIRMED","summary":"Poor HTTPs performance. Firefox 50.1.0 windows vs Chrome. Speedtest","severity":"S3"},{"last_change_time":"2022-10-11T19:54:16Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Layout","creation_time":"2017-11-02T05:56:45Z","severity":"S3","summary":"Performance is poor on Ebay.ca Watch List","priority":"P3","keywords":["perf"],"id":1413810},{"priority":"--","keywords":["perf:resource-use","power"],"id":1420699,"last_change_time":"2022-11-02T13:09:25Z","status":"UNCONFIRMED","component":"General","op_sys":"macOS","creation_time":"2017-11-26T11:01:38Z","severity":"S3","summary":"Firefox uses a lot of CPU on MacOS"},{"id":1425389,"keywords":["perf"],"priority":"P3","summary":"Low javascript performance on Firefox Quantum","severity":"S3","creation_time":"2017-12-15T01:56:41Z","op_sys":"Windows 10","component":"Graphics","status":"UNCONFIRMED","last_change_time":"2022-10-11T21:06:19Z"},{"summary":"User reports lag such as when opening several new tabs","severity":"S3","component":"Graphics","op_sys":"Windows 10","creation_time":"2018-10-30T23:19:36Z","last_change_time":"2022-10-11T22:09:30Z","status":"UNCONFIRMED","id":1503425,"keywords":["perf:responsiveness","regression"],"priority":"P3"},{"priority":"P3","keywords":["perf","perf:responsiveness"],"id":1522612,"status":"UNCONFIRMED","last_change_time":"2022-10-11T22:25:53Z","creation_time":"2019-01-24T19:01:08Z","component":"Performance","op_sys":"Unspecified","severity":"S3","summary":"9gag gets progressively slower to render as user scrolls down page (infinite scroll)"},{"keywords":["perf:responsiveness"],"id":1540026,"priority":"P3","severity":"S3","summary":"RTX On/Off comparison on nvidia.com runs at a drastically lower FPS in Firefox than in Chrome","status":"UNCONFIRMED","last_change_time":"2022-10-11T22:40:11Z","creation_time":"2019-03-29T04:39:42Z","op_sys":"Unspecified","component":"Graphics"},{"summary":"my cpu is 10-15 degrees hotter on firefox (55...60C) than on google chrome (45..50C)","severity":"S3","component":"Performance","op_sys":"Unspecified","creation_time":"2019-04-12T19:19:44Z","last_change_time":"2024-09-16T21:16:40Z","status":"UNCONFIRMED","id":1544091,"keywords":["perf:resource-use"],"priority":"P3"},{"priority":"P3","keywords":["perf:responsiveness"],"id":1556815,"last_change_time":"2022-10-11T22:55:45Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Performance","creation_time":"2019-06-04T18:10:31Z","severity":"S3","summary":"High CPU usage when browsing LinkedIn on Linux"},{"creation_time":"2019-06-10T12:35:43Z","op_sys":"Unspecified","component":"Performance","status":"UNCONFIRMED","last_change_time":"2023-10-05T13:53:23Z","summary":"Firefox freezes for 10 to 15 seconds every so often while working with Android Studio","severity":"S3","priority":"P5","id":1558170,"keywords":[]},{"status":"UNCONFIRMED","last_change_time":"2022-10-11T23:45:06Z","creation_time":"2019-12-15T22:12:58Z","component":"DOM: Device Interfaces","op_sys":"Unspecified","severity":"S3","summary":"Firefox Hangs Repeatedly Loading Some Sites","priority":"--","keywords":["perf:responsiveness"],"id":1604077},{"op_sys":"Linux","component":"Widget: Gtk","creation_time":"2020-04-08T07:02:56Z","last_change_time":"2023-05-16T18:03:55Z","status":"UNCONFIRMED","summary":"Middle button actions slow when primary selection belongs to a remote process","severity":"S3","priority":"P3","id":1628220,"keywords":["perf:responsiveness"]},{"severity":"--","summary":"HTML Based Speed Tests Produce Slower Results or Fail","status":"UNCONFIRMED","last_change_time":"2022-04-07T16:17:33Z","creation_time":"2020-05-13T13:55:53Z","component":"Performance","op_sys":"Unspecified","keywords":["perf:resource-use"],"id":1637606,"priority":"P3"},{"last_change_time":"2022-04-07T16:17:45Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Performance","creation_time":"2020-05-24T23:16:11Z","severity":"--","summary":"severe input lag when using multiple keyboards under linux(X11)","priority":"P3","keywords":["perf:responsiveness"],"id":1640535},{"priority":"P3","id":1654738,"keywords":["perf:resource-use"],"component":"Performance","op_sys":"Unspecified","creation_time":"2020-07-23T07:37:07Z","last_change_time":"2023-01-31T01:56:31Z","status":"UNCONFIRMED","summary":"High Memory Usage, differs from Task Manager, GC, CC, Minimize Memory","severity":"S3"},{"summary":"FireFox 78 x64 and newer on Windows after a while becomes slow","severity":"--","creation_time":"2020-08-20T08:08:34Z","component":"Performance","op_sys":"Unspecified","status":"UNCONFIRMED","last_change_time":"2022-04-07T16:20:24Z","id":1660184,"keywords":["perf:responsiveness"],"priority":"P3"},{"keywords":["perf:responsiveness"],"id":1663360,"priority":"P3","severity":"S4","summary":"Choppy Animation of Pie and Line chart during page load","status":"UNCONFIRMED","last_change_time":"2022-03-02T16:40:20Z","creation_time":"2020-09-06T21:27:19Z","component":"JavaScript Engine","op_sys":"Unspecified"},{"severity":"--","summary":"Scrolling in firefox on Android, clicking a link has become slow; have to click a link twice or thrice to open","last_change_time":"2024-02-27T18:15:06Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Unspecified","creation_time":"2020-11-12T06:14:31Z","keywords":["perf:responsiveness"],"id":1676799,"priority":"--"},{"severity":"S3","summary":"Firefox leaked RAM consumption on MacOS","last_change_time":"2022-08-31T11:49:30Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Graphics: Text","creation_time":"2020-11-19T10:26:47Z","keywords":[],"id":1678257,"priority":"P5"},{"creation_time":"2020-11-30T13:17:08Z","op_sys":"Unspecified","component":"Performance","status":"UNCONFIRMED","last_change_time":"2022-08-31T11:50:56Z","summary":"Two (and more) Firefox instances running at the same time have a bad impact for other applications on systems with 8GB of RAM","severity":"S3","priority":"P3","id":1679772,"keywords":[]},{"id":1686094,"keywords":["perf:responsiveness"],"priority":"P3","summary":"freezing on Facebook website with other tabs in the background","severity":"--","component":"Performance","op_sys":"Unspecified","creation_time":"2021-01-11T18:45:20Z","last_change_time":"2022-04-07T16:22:33Z","status":"UNCONFIRMED"},{"priority":"P3","keywords":["perf:resource-use"],"id":1695439,"status":"UNCONFIRMED","last_change_time":"2024-06-25T02:58:49Z","creation_time":"2021-02-27T16:46:04Z","component":"Performance","op_sys":"Unspecified","severity":"--","summary":"FireFox using too much RAM"},{"id":1711037,"keywords":["perf:responsiveness"],"priority":"P3","summary":"Twitter in a container freezes computer and drags Firefox to a halt","severity":"S3","op_sys":"Unspecified","component":"Performance","creation_time":"2021-05-13T13:39:18Z","last_change_time":"2022-12-23T03:41:20Z","status":"UNCONFIRMED"},{"priority":"P3","keywords":["perf:resource-use"],"id":1714911,"last_change_time":"2023-01-19T14:45:39Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Unspecified","creation_time":"2021-06-07T03:26:44Z","severity":"--","summary":"Unexpected memory usage in gmail tab"},{"severity":"--","summary":"Firefox Uses Over 12 GB of RAM When Accessing https://www.pch.com/sweepstakes/all-pch-sweeps","status":"UNCONFIRMED","last_change_time":"2022-04-07T16:24:35Z","creation_time":"2021-07-18T03:09:26Z","op_sys":"Unspecified","component":"Performance","keywords":["perf:resource-use"],"id":1721034,"priority":"P3"},{"keywords":["perf:resource-use"],"id":1721070,"priority":"P3","severity":"--","summary":"Firefox using 12%-30% cpu for no apparent reason (FF 91.0b3)","last_change_time":"2023-01-27T13:13:39Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Windows 10","creation_time":"2021-07-18T14:36:09Z"},{"severity":"--","summary":"High CPU usage in main process, seemingly spinning in poll()/recvmsg()=EAGAIN, but really RefreshDriver","last_change_time":"2023-01-27T13:12:53Z","status":"UNCONFIRMED","op_sys":"Linux","component":"Performance","creation_time":"2021-09-04T03:01:12Z","keywords":["perf:responsiveness"],"id":1729116,"priority":"--"},{"id":1753901,"keywords":["perf","perf:resource-use"],"priority":"P3","summary":"https://rationalwiki.org/wiki/Logical_fallacy using lots of CPU","severity":"S3","op_sys":"Unspecified","component":"Performance","creation_time":"2022-02-06T22:03:48Z","last_change_time":"2022-08-31T12:52:27Z","status":"UNCONFIRMED"},{"priority":"--","id":1765897,"keywords":["perf:animation","perf:responsiveness"],"creation_time":"2022-04-21T23:50:49Z","component":"Graphics: WebRender","op_sys":"Linux","status":"UNCONFIRMED","last_change_time":"2024-03-22T20:20:21Z","summary":"Performance on https://dragonflight.blizzard.com is not very good","severity":"S4"},{"severity":"--","summary":"Firefox freezes saving files to folder containing lots of images with GTK_USE_PORTAL=1 set (Linux, KDE Plasma 5)","last_change_time":"2024-04-03T23:11:13Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Widget: Gtk","creation_time":"2022-04-22T07:19:42Z","keywords":["perf:responsiveness"],"id":1765945,"priority":"P3"},{"severity":"--","summary":"Extreme performance drop when multiple windows are open on Ubuntu 21.10","status":"UNCONFIRMED","last_change_time":"2022-08-31T13:06:54Z","creation_time":"2022-04-22T20:43:40Z","op_sys":"Linux","component":"Widget: Gtk","keywords":["perf:animation","perf:responsiveness"],"id":1766063,"priority":"--"},{"priority":"P3","id":1768112,"keywords":["perf:resource-use"],"component":"Graphics: WebRender","op_sys":"Linux","creation_time":"2022-05-06T02:06:48Z","last_change_time":"2022-10-10T12:30:49Z","status":"UNCONFIRMED","summary":"firefox takes 80% CPU time due to invisible \"100 Thank-Yous\"","severity":"S3"},{"keywords":["perf:resource-use"],"id":1780732,"priority":"--","severity":"--","summary":"Memory leak","last_change_time":"2023-08-02T22:25:58Z","status":"UNCONFIRMED","component":"Audio/Video","op_sys":"Unspecified","creation_time":"2022-07-22T07:59:41Z"},{"priority":"--","id":1788552,"keywords":["perf:resource-use"],"component":"Performance","op_sys":"Unspecified","creation_time":"2022-09-01T00:29:13Z","last_change_time":"2024-06-28T12:12:39Z","status":"UNCONFIRMED","summary":"memory","severity":"--"},{"creation_time":"2022-09-11T15:24:54Z","op_sys":"macOS","component":"Graphics: WebRender","status":"UNCONFIRMED","last_change_time":"2024-04-03T01:49:26Z","summary":"high energy usage on mac m1","severity":"S4","priority":"--","id":1790262,"keywords":["perf:resource-use"]},{"keywords":["perf:resource-use"],"id":1794014,"priority":"--","severity":"--","summary":"using a lot of ram","status":"UNCONFIRMED","last_change_time":"2024-06-28T12:12:31Z","creation_time":"2022-10-06T18:18:54Z","component":"Performance","op_sys":"Unspecified"},{"op_sys":"Unspecified","component":"Graphics","creation_time":"2022-12-23T18:34:24Z","last_change_time":"2025-01-02T14:39:12Z","status":"UNCONFIRMED","summary":"Ram increases over time with GPU acceleration enabled","severity":"S3","priority":"P3","id":1807258,"keywords":["perf:resource-use","top50"]},{"summary":"specific page leads to 100% cpu with webrender software","severity":"S3","component":"Graphics: WebRender","op_sys":"Unspecified","creation_time":"2023-01-11T09:42:20Z","last_change_time":"2023-08-05T00:20:33Z","status":"UNCONFIRMED","id":1809608,"keywords":["perf:pageload","perf:responsiveness"],"priority":"--"},{"keywords":[],"id":1809674,"priority":"P3","severity":"S4","summary":"myemulator.online too slow (WASM, RTQueryCounter, and fingerprint-resist)","status":"UNCONFIRMED","last_change_time":"2023-12-08T01:59:42Z","creation_time":"2023-01-11T16:53:34Z","op_sys":"Unspecified","component":"JavaScript Engine"},{"keywords":["perf:responsiveness"],"id":1810733,"priority":"P3","severity":"S3","summary":"Firefox hangs on Linux when connecting to dbus","status":"UNCONFIRMED","last_change_time":"2023-07-12T07:24:17Z","creation_time":"2023-01-17T13:37:41Z","component":"Shell Integration","op_sys":"Linux"},{"component":"Graphics: WebRender","op_sys":"Windows 10","creation_time":"2023-01-24T11:34:09Z","last_change_time":"2024-03-23T00:38:50Z","status":"UNCONFIRMED","summary":"This reddit page with multiple playing videos causes slow compositing (worse than in Chrome)","severity":"S3","priority":"P2","id":1812018,"keywords":[]},{"priority":"--","id":1815134,"keywords":["perf:responsiveness"],"creation_time":"2023-02-05T20:33:45Z","component":"Performance","op_sys":"Unspecified","status":"UNCONFIRMED","last_change_time":"2023-02-24T16:37:52Z","summary":"Memory leak in \"Web Content\" after using firefox for a while","severity":"--"},{"last_change_time":"2023-04-27T20:37:49Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Windows 10","creation_time":"2023-03-04T00:27:34Z","severity":"--","summary":"Sometimes memory usage explodes","priority":"--","keywords":[],"id":1820299},{"creation_time":"2023-04-08T18:23:53Z","component":"Performance","op_sys":"Unspecified","status":"UNCONFIRMED","last_change_time":"2023-06-06T07:59:29Z","summary":"Excessive memory usage... since 112.0 Beta and 113.a1 Nightly","severity":"--","priority":"--","id":1827094,"keywords":["perf:resource-use"]},{"priority":"--","id":1831741,"keywords":["perf:resource-use","perf:responsiveness"],"creation_time":"2023-05-06T17:37:08Z","component":"Performance","op_sys":"Windows 10","status":"UNCONFIRMED","last_change_time":"2023-08-05T00:45:43Z","summary":"CPU throttling constantly","severity":"--"},{"summary":"Firefox is using a large amount of memory for tasks (750MB of gpu-committed)","severity":"--","creation_time":"2023-05-08T18:00:07Z","op_sys":"Unspecified","component":"Performance","status":"UNCONFIRMED","last_change_time":"2024-07-23T03:17:00Z","id":1831928,"keywords":["perf:resource-use"],"priority":"--"},{"severity":"--","summary":"Firefox 113.2.0 at Android 13. Audio and video stutter when using bluetooth output.","status":"UNCONFIRMED","last_change_time":"2024-12-06T03:10:36Z","creation_time":"2023-05-31T08:02:46Z","component":"Performance","op_sys":"Android","keywords":[],"id":1835986,"priority":"--"},{"priority":"--","keywords":["perf:responsiveness"],"id":1836199,"last_change_time":"2023-08-10T14:22:01Z","status":"UNCONFIRMED","op_sys":"Linux","component":"Graphics: CanvasWebGL","creation_time":"2023-06-01T06:11:17Z","severity":"S3","summary":"Nvidia+Intel dual GPU: PDF rendering freezes the system frequently for several seconds."},{"priority":"--","keywords":["perf:responsiveness"],"id":1837806,"status":"UNCONFIRMED","last_change_time":"2023-06-13T18:22:40Z","creation_time":"2023-06-10T19:37:16Z","component":"Performance","op_sys":"Unspecified","severity":"--","summary":"Firefox CPU usage hits 99 when scrolling, causing stuttering."},{"severity":"S3","summary":"High CPU use when browser is idle","last_change_time":"2024-09-12T14:54:36Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"JavaScript: GC","creation_time":"2023-06-17T20:08:01Z","keywords":["perf:resource-use"],"id":1839036,"priority":"P3"},{"priority":"--","keywords":["perf:pageload","top50"],"id":1840252,"last_change_time":"2024-08-29T17:46:29Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Unspecified","creation_time":"2023-06-24T21:08:25Z","severity":"--","summary":"YouTube takes 7 s to shows cookie banner"},{"op_sys":"Unspecified","component":"Graphics: ImageLib","creation_time":"2023-07-08T16:57:29Z","last_change_time":"2023-10-20T20:36:06Z","status":"UNCONFIRMED","summary":"Memory leak when SVG sprites are loaded (3300 SVGs)","severity":"S3","priority":"--","id":1842382,"keywords":["perf:pageload","reproducible"]},{"severity":"--","summary":"Firefox is consuming too many resources and is unstable. I've gone through the troubleshooting steps to no avail.","status":"UNCONFIRMED","last_change_time":"2023-08-18T17:18:21Z","creation_time":"2023-07-24T08:08:35Z","component":"Performance","op_sys":"Unspecified","keywords":["perf:resource-use","perf:responsiveness"],"id":1845044,"priority":"--"},{"summary":"Obfuscated JS with huge amounts of function creation performs poorly.","severity":"S3","creation_time":"2023-07-29T05:28:41Z","op_sys":"Unspecified","component":"JavaScript Engine","status":"UNCONFIRMED","last_change_time":"2024-12-03T18:28:56Z","id":1846115,"keywords":["perf:animation","reproducible"],"priority":"P3"},{"keywords":[],"id":1848585,"priority":"P3","severity":"S3","summary":"delete cookies on shutdown is very slow","status":"UNCONFIRMED","last_change_time":"2023-09-19T16:15:15Z","creation_time":"2023-08-14T07:08:31Z","op_sys":"Unspecified","component":"Data Sanitization"},{"component":"Performance","op_sys":"Linux","creation_time":"2023-09-03T19:45:09Z","last_change_time":"2023-09-19T16:23:06Z","status":"UNCONFIRMED","summary":"Regression in 117 release","severity":"--","priority":"--","id":1851386,"keywords":[]},{"priority":"P3","keywords":["perf:resource-use","regression"],"id":1852930,"status":"UNCONFIRMED","last_change_time":"2023-12-04T12:42:13Z","creation_time":"2023-09-13T10:48:40Z","op_sys":"Unspecified","component":"Security: Process Sandboxing","severity":"S3","summary":"Runaway process \"plugin-container.app\" is usurping system resources"},{"priority":"--","id":1854628,"keywords":["perf:resource-use"],"component":"Graphics: CanvasWebGL","op_sys":"Unspecified","creation_time":"2023-09-22T13:40:44Z","last_change_time":"2024-05-06T12:22:20Z","status":"UNCONFIRMED","summary":"Huge memory leak, possibly in WebGL (Windows and Linux)","severity":"--"},{"id":1860663,"keywords":[],"priority":"--","summary":"Firefox sometimes freezes with constant CPU usage when bringing up the Back history list","severity":"--","creation_time":"2023-10-23T20:42:11Z","component":"Performance","op_sys":"Unspecified","status":"UNCONFIRMED","last_change_time":"2024-01-24T16:21:18Z"},{"priority":"P3","id":1861856,"keywords":["perf:startup"],"creation_time":"2023-10-29T10:19:06Z","op_sys":"Unspecified","component":"Performance","status":"UNCONFIRMED","last_change_time":"2024-01-20T12:40:32Z","summary":"[Linux] Native Wayland loads the DOM A LOT slower than XWayland?","severity":"S3"},{"priority":"--","id":1861870,"keywords":["memory-footprint","perf:resource-use"],"component":"Performance","op_sys":"Unspecified","creation_time":"2023-10-29T15:50:14Z","last_change_time":"2024-01-24T16:27:08Z","status":"UNCONFIRMED","summary":"Memory leak in firefox","severity":"--"},{"summary":"while gtk3 dev is installed, and exists libgail.so, firefox cannot find it.","severity":"--","op_sys":"Unspecified","component":"Widget: Gtk","creation_time":"2023-12-06T16:58:13Z","last_change_time":"2024-02-09T13:13:26Z","status":"UNCONFIRMED","id":1868609,"keywords":["perf:startup"],"priority":"P3"},{"priority":"P3","keywords":["perf:resource-use"],"id":1870778,"last_change_time":"2024-02-09T14:45:57Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"PDF Viewer","creation_time":"2023-12-19T05:55:02Z","severity":"S3","summary":"Potential Memory Leak When accessing PDF with User Agent Spoof"},{"keywords":[],"id":1876284,"priority":"P3","severity":"S3","summary":"Firefox \"crash\" after a while PC locked","last_change_time":"2024-03-17T20:17:44Z","status":"UNCONFIRMED","component":"Performance","op_sys":"Unspecified","creation_time":"2024-01-24T13:28:27Z"},{"priority":"--","keywords":["perf:resource-use","perf:responsiveness"],"id":1882804,"last_change_time":"2024-03-12T15:29:31Z","status":"UNCONFIRMED","op_sys":"macOS","component":"Graphics: Canvas2D","creation_time":"2024-02-29T15:28:41Z","severity":"S3","summary":"[GPU-canvas] Viewing webcam is slow (due to filters and gpu-canvas not falling back to skia-canvas)"},{"priority":"--","id":1889461,"keywords":["perf:resource-use"],"creation_time":"2024-04-03T19:07:11Z","component":"Performance","op_sys":"Android","status":"UNCONFIRMED","last_change_time":"2025-01-02T09:21:24Z","summary":"Ozon.ru eats up RAM","severity":"--"},{"summary":"Firefox is using significantly more memory than usual.","severity":"S4","component":"Performance","op_sys":"Windows","creation_time":"2024-04-16T00:46:27Z","last_change_time":"2024-12-02T12:33:24Z","status":"UNCONFIRMED","id":1891632,"keywords":[],"priority":"--"},{"priority":"--","id":1891979,"keywords":[],"op_sys":"Unspecified","component":"Performance","creation_time":"2024-04-17T13:04:16Z","last_change_time":"2024-10-08T17:35:09Z","status":"UNCONFIRMED","summary":"Very High Ram usage","severity":"--"},{"severity":"--","summary":"Firefox takes up more than 1 GB of RAM even with only 7 tabs open","status":"UNCONFIRMED","last_change_time":"2024-06-07T16:45:16Z","creation_time":"2024-04-30T06:15:07Z","op_sys":"Unspecified","component":"Graphics","keywords":[],"id":1894163,"priority":"--"},{"priority":"--","keywords":["perf:resource-use"],"id":1897710,"status":"UNCONFIRMED","last_change_time":"2024-10-08T17:35:05Z","creation_time":"2024-05-20T06:28:31Z","op_sys":"Unspecified","component":"Performance","severity":"--","summary":"Firefox utilizing a large amount of RAM (2.5gb with small amount of TABS open)"},{"creation_time":"2024-08-21T06:38:36Z","component":"DOM: Events","op_sys":"Windows 11","status":"UNCONFIRMED","last_change_time":"2024-11-24T18:59:10Z","summary":"tab movement seems a little bit laggy","severity":"--","priority":"--","id":1914114,"keywords":[]},{"last_change_time":"2024-12-18T16:56:29Z","status":"UNCONFIRMED","op_sys":"Unspecified","component":"Graphics","creation_time":"2024-09-14T17:04:25Z","severity":"S4","summary":"Stuttering when using multiple windows","priority":"P3","keywords":["perf:responsiveness"],"id":1918876},{"op_sys":"Unspecified","component":"Widget: Gtk","creation_time":"2024-09-28T06:28:31Z","last_change_time":"2024-12-26T12:50:51Z","status":"UNCONFIRMED","summary":"BHR-detected hang","severity":"--","priority":"--","id":1921589,"keywords":[]}]}