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Is there a Firefox Task Manager (like in Google Chrome) that would allow me to see how much RAM my plugins/extensions/tabs are using?

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From Firefox 6+ there is about:memory; so you'll need to upgrade to a newer less stable version.

For example, this is what Firefox 9.0a1 displays:

That's indeed a tab. Extensions are not shown as far as I know; plugins are available as a process:

enter image description here

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I don't know a way to do this in Firefox 5. In Firefox 7, about:memory got a lot of upgrades, including at least part of what you want.

Edit: Another answer has a nice screenshot, but I believe it will show the memory usage for each tab.

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Could you explain more about how the about:memory page might show him this? –  Simon Sheehan Aug 20 '11 at 20:28
    
Something like this works in Firefox 5.0 –  Boris_yo Aug 21 '11 at 13:47
    
about:memory works in several previous versions, but it isn't as itemized; usually most of the memory is in very big categories that don't help too much. –  Ben Kraft Aug 21 '11 at 15:40
    
Cannot understand what all what is there means. Must pinpoint the culprit... –  Boris_yo Aug 23 '11 at 20:22
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