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FF 3.5 or FF 4?
Export your bookmarks / saved info / mark down apps& adons used, Uninstall FF, reboot, reinstall latest full version. Then see what happens.
FireFox is poor at releasing memory so if you are a tab junkie like me and have 3-4 FF windows with 5-15 tabs each, you need to close and reload in order to release all the memory from Firefox. Just closing tabs will not release much memory. One bad site in the tabs will leak memory / crush CPU time. Unlike IE 8 and prior (haven't used 9 due to compatibility issues), FF will not release pool memory by browser, IE opens specific instance of mem/CPU by window so it tolerates open and closing enough.
Once my FF usage goes beyond 370-430MB or memory in use, it slows real quick and will often enough lock up.
Have not used FF4 on my main rig yet but will start soon.
I like Chrome but use mostly IE and FF because that is whet my clients use most.
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