Multiple tabs performance issue

[reaper666735]

Describe the bug

Hello,

i might have stumbled over a performance issue when using WF over longer periods of time, if i open many tabs over a "session" ( for example 25-30) it seems to be allocating a big amount of RAM and starting multiple processes of WF in the background, that in itself i understand :p, BUT even after closing down all but one tab the most of the RAM and none of the extra processes stop, it's like it wont 'release' the resources it had been using .... stopping WF completely solves this issue thankfully but it seems like this is not something that should be happening/intended :p

To Reproduce

• open Resource Manager see baseline levels (RAM and Processes)

• start WF classic

• open 30+ tabs wildly (preferably with content like pictures or video's not blank pages ...)

• check resource manager again

• close all tabs but one and see barely a difference going down

• close WF completely to see all back to baseline

• Version: 2021.10 (64bit)

[Squall-Leonhart]

you have an extension installed that holds the content processes open, youtube enhancer is known to do so, same as anything that customizes web pages.

[lokpro]

"anything that customizes web pages." like DarkReader, ___Monkeys(userscript manager), ad removers? :O

[reaper666735]

would Ublock be among them ?

[lokpro]

@reaper666735 you can try it in safe mode to see if that is the reason.

https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode

[Squall-Leonhart]

like DarkReader, ___Monkeys(userscript manager), ad removers? :O

Yes. Stylish for example does this.

[reallyuniquename]

an extension installed that holds the content processes open

Is there any userscript + userstyle manager combo that definitely does not do this on Classic?

[reallyuniquename]

@Squall-Leonhart

you have an extension installed that holds the content processes open

Any ideas how to close this kind of tab without killing the actual e10s process?