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You might want to upgrade if you watch web videos (I bet you do!). Some noticable fixes in FF 2.0.1 include:
>> Memory leak when loading Google Firefox homepage, clicking bookmark, and closing window
>> Memory leak on Google personalized home page
>> [Firefox:Installer]-Bookmarks missing, tabs broken, etc. (Firefox 2 install over Firefox 1.5.0.7 failed to replace some files.)

source: Digital Inspiration.