How to know each TAB memory usage ?

Hi, is it possible to know that, if Firefox or any browser is opened, whats the amount of memory taken up by each TAB of web-browser ?

I am just curious to know.

Asked By: Raja G


In Firefox Quantum, you can use about:performance.

There is also about:memory where you can “view, save, load, and diff detailed measurements of Firefox’s memory usage”.

Answer history:


An user requested this feature five months ago in Mozilla Support forum. Quoting the answer of the moderator, “Mozilla is working on that through the Electrolysis project“.


Project Electrolysis has been released! Now Firefox is also multi-process.

Answered By: Yamaneko

Type about:memory?verbose in the url bar, and check each of window nodes. It should do the trick.

Answered By: jasmines

Unfortunately the way that Firefox tabs are implemented, and the way that about:memory is structured, it is not trivial to determine the memory usage per-tab. about:memory is really a tool for debugging and development purposes, and since tabs are still part of the same process, you cannot get the same per-tab stats you do in Chrome/Chromium.

You won’t get a better answer from your bounty, because there’s nothing anyone can do about that at this time.

In the latest nightly from the Mozilla nightly PPA, this is what about:memory looks like (I’ve selected the section that shows you the open tabs):

About:memory screenshot

As you can see it is possible to tell by the URL which tab is being referred to, but in reality there is memory being used in other aspects that cannot be illustrated accurately here because it is all one process, but many threads.

Answered By: RolandiXor

For Firefox, I’ve made an addon which displays tab memory usage in the corresponding tab’s title.

Provides user with tab related stats and memory usage ..



  • How many tabs are currently open
  • How many tabs have been opened during this Firefox session
  • How many tabs have been opened since addon installed
  • Display tab memory usage in title
  • Preference to toggle tab memory usage on/off
  • Preference to set interval between memory usage collection
Answered By: bobbyrne01

I use the other Firefox extension. It is called Tab Memory Usage,

Answered By: Belaviyo

Try using about:performance. It seems to give real-time data similar to Chrome’s Task Manager.

The add-ons don’t work in Firefox Quantum, since the add-on framework has been changed now.

Answered By: ADTC

Firefox 65 released on 29-01-2019 added memory usage to the task manager page found at about:performance.

Answered By: Abdelaziz Mokhnache

There is 1 more way to get this info.
Visit this in your browser:

Answered By: ankk98
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