FF3 is almost mind-bogglingly faster on several sites that I visit than FF2 was, so it won me over almost the instant I upgraded. I'm a big fan of the dialog-box text recovery upon a crash, too, since that caused me a great deal of grief on several occasions in the past. Most of my extensions upgraded promptly, and I managed to find better replacements for those that didn't. I can count the number of times I use the address bar per week on one hand, so I don't think I'm even aware of what the changes there do; I do know that there's an extension available to revert it back to the FF2 behavior. As a whole, the thing feels much more stable than its predecessor; I haven't had any major problems at all since the upgrade.