Ocsigen.org freezes when clicking links

[leviroth]

Describe the issue

Chrome tabs freeze when navigating links on Ocsigen.org. The page becomes unresponsive, and the tab takes longer than normal to close.

One or more specific URLs where the issue occurs

http://ocsigen.org/

Steps for anyone to reproduce the issue

1. Visit http://ocsigen.org/.
2. Click the big button that says "Tutorial: Your first app in 5 minutes!"
3. Observed behavior: address bar changes to the target link; page does not update; the mouse pointer remains in the "pointer finger" state everywhere on the page. Fan starts running very high, but I couldn't get the Chrome dev tools profiler to work, presumably because the tab itself wasn't responsive.
4. Middle-click the browser tab to close it; there will be a noticeable lag before the page is able to close.

Your settings

• OS/version: Windows 10 with the Fall Creators Update (version 1709)
• Browser/version: Chrome 62
• uBlock Origin version: 1.14.20

This is with default settings/filter lists and no other extensions enabled.

[leviroth]

In lieu of a proper profile, here is what the Chrome process manager looks like after allowing the tab to stall for 5-10 seconds. The CPU usage was at a steady 25%, while the memory kept growing.

[uBlock-user]

Can reproduce on Chromium 64 too, it freezes. Can't open console either.

[gorhill]

The site's code is constantly removing uBO's style tag as fast as it is re-added.

Disabling cosmetic filtering makes this silly fight go away.

[mapx-]

I disabled all filters / lists, then added the filters bellow 1 by 1

filters triggering that behaviour:

##A[href*="/click.php"]
##[id=likepagefb]
##[Lol^="abcd"]

filters which don't trigger:

###likepagefb
site.com##A[href^="abcd"]

so, generic filters but not all of them

[gorhill]

The first filters are categorized as highly generics and always injected. The other ones are lowly generic but match nothing on the page.