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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.

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It's currently still on Firefox wishlist, see issues 400120 and 515352. – Skippy le Grand Gourou Nov 13 '14 at 22:24
up vote 7 down vote accepted

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
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You can use about:memory. But, it does not look very well organized such as Google Chrome. Maybe an extension, like StatusbarEx.


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".

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thanks but its good for firefox 4.0 and now i am at 16 . one more thing is its not showing for each TAB .what ever the functionality i can get from that add-on, i can get easily from the top or htop commands with terminal . – Raja Nov 13 '12 at 4:59
@ican: I've found the project Electrolysis through which Mozilla will implement this feature. I also updated my answer. – Yamaneko Nov 13 '12 at 5:32
it seems to be not yet finished , – Raja Nov 13 '12 at 14:43

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

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where i can get the description of all those text. – Raja Nov 17 '12 at 2:16
I didn't find anything yet on Mozilla support site, but it's quite simple, just click on window type nodes and they will collpase, so you can see only parent nodes. – jasmines Nov 17 '12 at 5:59

It's easy to view memory usage per-tab in Chromium and Chrome:

  • Click the menu button Menu button

  • Select 'View Background Pages' Tab memory for Chromium (and Chrome)


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this is good for chromium and chrome but where I can get for firefox ? – Raja Nov 22 '12 at 7:23
How is this the accepted answer if it doesn't even answer the question? – Bart Nov 19 '14 at 13:10

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.

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but the chrome doing it and why can't we do something parallel . – Raja Nov 22 '12 at 7:25
@ican: I think this is the purpose of the Electrolysis project. It will provide, in the future releases, a similar tool. – Yamaneko Nov 22 '12 at 14:08
@VictorHugo Hi,Thanks for the reply . :D . So i think probably i should wait up to that . :) – Raja Nov 23 '12 at 2:33
@ican: Yeah, I hope this feature comes soon :) – Yamaneko Nov 23 '12 at 12:46

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

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