I just got s new PC with Windows 7 (64bit). I installed FF 3.6 and copied over the profiel from my old Windows XP PC. It ran fine for a few days then I upgraded to FF 4. FF will run fine ofr a while and then suddenly when I click on a link the tab flashes "Connecting" and it just sits there forever. If I close FF and then try to reatart it say FF is already running. Eventually I have to go into TaskManager and kill the process. FF then starts normally and runs fine for a while anywhere from 2 to 20 minutes and then I'll click on a link and it goes into COnnecting again. My other PC runs fine with FF 3.6 and WIndows XP. Has anyone seen this? Any ideas how to fix it?