Changing pages, I often get the counterrevolving circle with "connecting". Would go on forever if .....
...I didn't force-quit FF, which then locks up the Mac. Current version of FF, Mac Pro running 10.6.8.
Alla svar (1)
What web pages does this happen? A few sites, many all?
Start Firefox in Safe Mode {web link} While you are in safe mode;
Type about:preferences#advanced<Enter> in the address bar.
Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.
Poke around safe web sites. Are there any problems?