I loaded up Firefox RC3 tonight in OSX and it said that there were no updates available at this time. Um... so either Firefox 3.0 final is identical to RC3 or their update system is not working right. Oddly enough, I just lost the cursor for the message reply box in Firefox3 here and about 10 minutes ago I had a MacOSX kernel panic for no apparent reason (I was just surfing in Firefox3). I've had about two total kernel panics in Tiger EVER so again, it might be a coincidence, but it seems pretty strange. The machine has only been running without a reboot for about 3 days. The last time I started getting glitches where I felt a reboot would help was a bout a two week run (barring that odd incident where the DVD player seemed to make sound scratchy in the newly upgraded iTunes until I rebooted (but that wasn't a kernel panic).
Ok, after I clicked off the message box and on again, the cursor reappeared, at least....
I've seen no mention in FF3 articles whether the final RC candidate is identical to the final release. I would have thought no (even if no major changes occurred), but again, there was no update offered here.