I've been having a lot of trouble with Firefox 4 and 5 hanging on my Windows XP machine. I've often found a temporary solution of uninstalling and reinstalling. Recently I deleted my Firefox profile to get a clean start. But nothing seems a reliable solution.

The only plugin that I have is Firebug. My machine is a bit low on RAM, with only 2 GB.

Am I missing something? Any troubleshooting steps that you would recommend? I've come to expect Firefox to be very stable, and that has not at all been my experience lately.