Firefox has been crashing multiple times a day since 03/05/2012 20:50 (this was the first crash for months). I have updated all my windows updates, updated plugins, tried opening in safe mode, tried closing any tabs that could be causing a problem, but it is still happening. I have also done virus scans, and McAfee isn't coming up with any problems there.
Sometimes it says it's not responding, and then closes, at other times there is no warning, it just crashes.
It has crashed so far 6 times in less than an hour today.
Thanks for your help, the problem was with Trusteer Rapport, though updating my drivers did help somewhat. Trusteer are still looking at the problem, as they don't know exactly what is causing it, but everything's good with rapport turned off!