FF 3.5.8 had so many problems I stopped using Firefox. Chrome caused me even more problems, so I’m spinning my wheels on the lesser of 3 evils now; IE8. Might try out FF3.6 or move to Opera next.
Can’t remember if the problem started with the rollout of 3.5.8 or not, but 3.6 fixed it. I use AVG and also found I was getting a lot of crashes when their SafeSearch add-on was turned on. Maybe that was 3.5.8 specific as well. I might try turning it back on and see if everyone plays nice now.