I just saw that the first Release Candidate of Firefox 3 is available for download . As with the most of the Beta-versions I also checked this update because I’m really excited to get the new features, but after 5 minutes (again) I removed it from my PC. Non of my extensions is working in FF3 (except the dictionary), it still destroys the Frames in TYPO3 (there’s a bugfix-extension for that) and the memory-usage is still very high,10% lower than in FF2 but still high.
So I postponed the update and kept on running Firefox 2, at least until the next Release Candidate ;)