Identify which tabs are using high memory or CPU

[D4732]

Even though I have 16 GB of memory, Firefox sometimes eats up lots of it and/or lots of CPU when I have many windows and tabs open. 

It's impossible to find the high consuming tabs.  Give us a command or display to identify which tabs are the highest resource hogs.

Thanks!

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[heaversm]

While there is nothing as easy as what you're describing, Firefox now has a "Power" profiler that allows you to record the activity of a tab and understand its Power usage:

https://profiler.firefox.com/

Make sure if you enable this to select the "Power" setting.

[jscher2000]

There is an internal page with the address about:processes that -- at least on Windows -- allows you to see Memory and CPU usage per process, and lists which tabs are in that process. Starting in Firefox 108, Shift+Esc opens that internal page.

[Jon]

Hey @D4732 ,

Following up to see if our Tab Unloading feature addresses what you're looking for. Learn more here: https://firefox-source-docs.mozilla.org/browser/tabunloader/

Looking forward to hearing more of your thoughts.

[adsdfads]

Unfortunately about:processes doesn't work for you if you have something like this:
https://staticblitz.com (63021, cross-origin isolated)

You can't find it neither in the tabs list (because this domain is not open), nor in the about:debugging#/runtime/this-firefox because this worker (or what is it actually?) is registered to another domain.

You can't even copy its name because somebody set user-select: none to the whole about:processes table without ability to copy information in any other way.

So it is working somewhere, eating up to 100% of CPU and I have no other way to kill it than closing my tabs one by one and hoping that it works.

[Jon]

Related idea here: Energy saving tabs 

[heaversm]

@adsdfads- you may want to file a bug about this in Bugzilla - I'm sure the team would be interested to know about the limitations there if they're not already aware.

[raindrops]

Google Chrome has this feature. I wish it was available on Firefox,

[adsdfads]

Filed a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1879106

[heaversm]

@raindrops  You're talking about this, correct?

[heaversm]

@adsdfads- amazing - thanks for your contribution!

[mozillagorilla]

decorating, outlining or colorizing the actual tabs would be a way to visually highlight the offending tabs