... Why does Firefox 3 have no scroll bars? Do they just assume that everyone has a wheel mouse by now and scroll bars are obsolete? Is there some hidden configuration setting somewhere to enable scroll bars, lacking which they're not displayed for the sake of artistic cleanliness or something?
Firefox 3 seems to have several annoying "features" that, as far as I can see so far, cannot be turned off. Perhaps the most annoying I've found so far is that if you view an image directly with multiple tabs open, FF3 will replicate the entire image in the tab. Which, if it's a large image, means your tab bar suddenly takes over the entire Firefox window.
I'll grant the improved speed is very nice, and video integration seems much better. But I think there's major interface functionality issues with Firefox 3 that need to be addressed before it's ready for prime time.
(Seriously ... disabling scrollbars by default? Whose stupid idea was that?)
Update:
It appears I unjustly blamed Firefox 3 RC2. Something in my profile — a setting, an add-on, I don't know yet — that works fine in 3.0RC1 is causing problems in 3.0RC2. Started in safe mode, RC2 works as expected. I haven't had time to isolate the problem yet, but I'm going to start with add-ons.