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Firefox caches recently view pages so if you decide to hit 'back', it won't have to fetch it again.
Across multiple tabs, it means that a lot of pages are being stored, leading to large amounts of memory being consumed. There is a way to turn it off, or at least to use less memory, but it's not easily accessible.
Here are a few tips that you can use to reduce Firefox memory usage:
http://kb.mozillazine.org/Reducing_...usage_-_Firefox
http://googlesystem.blogspot.com/20...in-firefox.html
http://www.liewcf.com/blog/archives...x-memory-usage/
Personally, I don't/haven't used any of the above settings, and I've seen Firefox use 200+ MB.
If you're using an older version <2.0, you should upgrade, as a few of the more common memory leaks have been fixed.
Hope this helps.
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