I use FF 3.5.2. I use an unibody macbook 2GB with 4GB. My firefox acts weird most of the time I don't know. When I scroll down pages it will freeze for 3-4 seconds then continue scrolling. As I was typing this... it froze for 2-3 seconds after I typed "most of the time" then it was normal. Any clue? I also don't know where to back up my saved passwords so I can do a reinstall? But I thought it was the problem with "Smooth scrolling" (damn it, froze after 'scro' again for 2-3 seconds then continued. It doesn't happen with Safari though.