Why does Firefox crash on my Macbook?

Maybe try to open it and clear the prefs temporarily, I find this clears up a lot of application related issues.
To do this hold shift while opening firefox.

Ok I tried it. Not sure if it worked, so here’s to hoping!

I have the same problem. The only difference is that sometimes I can make it through the day without it acting weird and sometimes it happens a couple times a day. I found that quitting Firefox and restarting it is enough to clear up the problem.

I have been battling with this for a long time and nothing seems to help. It is a little better with Firefox 3 but it still happens.

The thing is though, this never used to happen to me. I believe it was an update or something, because it randomly started happening.

Me too. I think it was around the upgrade to 2.0.1.4 that I started having problems.

You reinstalled, but did you make sure to delete all of your old profile information? Most of the problems I’ve had with Firefox over the years have been because of corrupted profiles, and can be easily fixed by starting with a fresh one. Usually such profile corruption is concurrent either with an upgrade to Firefox or the installation or upgrade of an extension.