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There's a number of major memory usage bugs that have been fixed in Firefox 7 -- both leaks and issues with garbage collection and fragmentation.

For example:

https://bugzilla.mozilla.org/show_bug.cgi?id=666058#c31

https://bugzilla.mozilla.org/show_bug.cgi?id=656120#c44

The second bug specifically should help resolve the "Firefox has been open for two days and now it eats my entire system" problem.



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