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I was looking over Chrome and the task manager feature and really wishing something like this was in Firefox (as i have lots of addons [probably too many] and lots of tabs open). I looked for an addon or something but perhaps I have missed something? Anyone know of something like Chrome's task manager but for FF?

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  • I need that to clear the RAM. Tab unloaders do not work. Chrome task manager is highly useful, so Firefox just needs it.
    – neverMind9
    Jun 23, 2018 at 15:04
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    Type this into your address bar in Firefox: "about:performance" (without quotes).
    – LonnieBest
    Nov 27, 2018 at 8:24
  • For Firefox 75 they have this option built-in to the menu. support.mozilla.org/en-US/kb/…
    – tlbignerd
    Apr 27, 2020 at 18:40

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There's a couple things you can do to see what kind of overhead you've imposed on Firefox.

The about:addons-memory Extension will give you a nice looking page showing how much memory each of your extensions is using. You can use that information to decide if the overhead imposed is worth the functionality it provides, or if you should look for a more lightweight extension that has similar functionality.

Also, the about:memory page will give you a very technical view of how Firefox is using the memory that's been allocated.

Be careful though, both views give fairly technical information and can be easily misleading if you don't truly understand what you're looking at, how memory allocation in Firefox works, and how your OS manages memory.

As far as I know Firefox doesn't have any built-in way to show the other details that Chrome's Task Manager does, like CPU and Network usage. As @RobK alluded to, Firefox's current architecture may not make providing such statistics easy (or even possible).

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    about:addons-memory is currently broken for me(firefox 47). It hasn't been updated since 2014
    – Bryce Guinta
    Jul 10, 2016 at 3:00
  • Unfortunately, I can not unload tabs. And the tab unloading add-ons are all bogus.
    – neverMind9
    Jul 14, 2018 at 22:07
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Firefox does not have a task manager. Unfortunately, due to Firefox's architecture it would be difficult to monitor per-tab.

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  • What about Quantum? (I do not like Quantum. But it works similarly to Chrome: seperate processes).
    – neverMind9
    Jun 23, 2018 at 15:04
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There will not be any task manager in Firefox in the foreseeable future. Firefox now feature the Firefox Health Report.

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