Hey sweiner1,

Have you tried starting Firefox in Safe Mode? Try holding down shift while it is starting up. If it works in Safe Mode, you should look at Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

If that doesn't work, I'd look at the article Troubleshoot Firefox crashes (closing or quitting unexpectedly). There will be a lot of troubleshooting help in there.

Hopefully this helps!

Both Trusteer Rapport and Roboform are known to cause Firefox 8 to crash, even in Safe Mode.

Do you have Trusteer Rapport installed? If so, disable it.

   * Windows: "Start->All Programs->Trusteer Rapport->Stop Rapport"
   * Mac: "System Preferences -> Other -> Rapport -> Stop Rapport" 

For more help you can ask their helpdesk.
http://www.trusteer.com/support/en/report-problem

http://kb.mozillazine.org/Firefox_crashes#Trusteer_Rapport

Roboform is also causing Firefox 8 to crash upon startup. Install the latest 7.6.4 version of Roboform.
http://www.roboform.com/support/news

Also, Firefox 8.0.1 was released 11/22/11 and has a patch for some crashes on Windows, but it's not being pushed as an update to all Firefox 8.0 users on Windows - you need to download it separately and install it yourself.

Thanks, Matt G!! Safe Mode allowed it to start up and I used the troubleshooting extensions to find which extension was causing the problem! Thank you!!