FireFox 2.0 (Mac) is Crappy, Broken
It hangs (with spinning rainbow of death) all the time. Sometime it just crashes.
I'm switching back to 1.5 for a while. Luckily, it appears you can (at least FF 2.0 doesn't mess up your settings/prefs in an incompatible way...)
I wonder if the Windows or Linux versions are just as bad.
Update: Derek points out that google toolbar is the culprit. I've disabled it, and I'm back to FF2. I'll post later if it helps or not.