Running extensions in both Chrome and Firefox leaves temporary directories

[ghostwords]

Is this a feature request or a bug?

Bug

What is the current behavior?

Running extensions in both Chrome and Firefox still leaves temporary directories. This happens despite web-ext logging that it cleans up some temp directory on exit in verbose mode. (The directory logged is indeed missing, but others remain.)

Here are some recent leftover folders in /tmp/:

.com.google.Chrome.tV0jJO
tmp-web-ext--2445-Rid4u33i0TaN
.com.google.Chrome.1YiHq1
tmp-web-ext--9065-2sTtAd1ZXCx2
lighthouse.cc52DU2
lighthouse.elq0cnz
lighthouse.1p1kCZO
lighthouse.aEuUs7s
lighthouse.GxOVGAS
lighthouse.LTtzBYw
vxRzd7e
lighthouse.mXLE5jI
tmp-web-ext--8248-8w2G2D5WDdNB

The "lighthouse", "Chrome" and "vxRzd7e"-like folders come from Chrome, I think. "tmp-web-ext" folders are from Firefox.

"lighthouse" folders in particular seem to sometimes grow to hundreds of megabytes in size when a web-ext run session is left running for days.

Versions

web-ext 5.0.0
Various versions (both latest and older) of Firefox and Chrome.

[ghostwords]

#1957 sounds related.

[Rob--W]

Confirmed with -t chromium, but not reproducible with Firefox. Are you seeing this with web-ext run (Firefox)?

We should either ensure that the directory content is destroyed, or call tmp.setGracefulCleanup() in https://github.com/mozilla/web-ext/blob/cfc49ce803a9a320d06af5871a2e3aa8a8c533b5/src/util/temp-dir.js

[ghostwords]

Yes, the tmp-web-ext folders are from Firefox runs. I just tried again with the latest version of Firefox and got two new folders with names like "Temp-075a8052-2cd9-4460-8ac9-13e76c3aa77e". Plus there are a bunch of "rust_mozprofile.pspDgJWpvtWe" folders too, also probably from Firefox. These are all in /tmp. It's possible some of these are not from web-ext, but I'm sure a lot of them are.