Although your browser will not detect it and the update has not appeared on the Firefox homepage yet, you can download the final release version of Firefox 2.0.0.1. The link below takes you directly to the installable file to download.
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.