Start=>All Programs=>Mozilla Firefox=>Mozilla Firefox (safe mode)
If it starts and runs well, then your problem is probably one of your extensions/addons. Disable all ext/adds fire it up normal, add back the ext/adds till it craps again, showing which ext/add is the culprit. repeat safe mode to remove the offending add on.
If that is not the problem:
Start=>run=>firefox -ProfileManager
Create a new profile, log into it instead of your normal one. If it runs fine in the new profile, your profile is the problem. Save your bookmarks, then delete the old profile.
I followed your instructions and put it in the safe mode. I checked the extensions/addons.
I'm typing very slowly and I'm afraid to breath hard, it might send me another error message.
I'm getting off FR to see if I can come back without a problem.