Mozilla has now released Firefox 3.0.1. There are several security fixes and stability fixes which you can check out in the release notes. I’m using version 3 since the beta release and Firefox 3 has just some awesome features. Recently, there was an update for Firefox 2 (version 18.104.22.168) which can also be downloaded on the Mozilla website. So Firefox 2 is still being updated.
For those who don’t want to uninstall Firefox 2: you could also install Firefox 3 parallely and use your Firefox 2 profiles (the default profile is used automatically. But you could also use two separate profiles for Firefox 2 and 3. Just take a look at my article in order to do this.