Does anyone have problems with firefox crashing all the time?

I have this problem on both XP Pro SP2 boxes that I'm running Firefox 1.0 on.

It only seems to happen when I'm using tabs. It crashes when I'm on AO all the time.
It is really starting to get annoying.

I've tried uninstalling and reinstalling. Installing to a different directory. Changing user profiles.
Nothing seems to fix the problem.