Firefox will open but crash within 5 seconds of opening. I have done deep uninstall and clean install of firefox using both 3.6.12 and 4.0.7beta versions, but continue to face the same problem. I have followed instructions on https://support.mozilla.com/en-US/questions/762084 to try to resolve my problem, attempting to create a new profile by accessing profile manager via Terminal. After entering Applications/Firefox.app/Contents/MacOS/firefox-bin -profilemanager, the Mozilla Crash Manager pops up again informing me that Firefox has crashed. Help is greatly appreciated. Prior to this problem, the last activity I remember doing on FF was checking my gmail. Other browsers like Safari and Chrome run fine, but is frustrating because FF is my primary browser!