Hey berrypie11,

Have you tried starting Firefox in Safe Mode? Hold down "shift" while Firefox is starting up. If the crash doesn't happen in Safe Mode, you should read Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

There is also a lot of useful stuff in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) Knowledge Base article.

Hopefully this helps!

Your crashreport:
https://crash-stats.mozilla.com/report/index/bp-0532aa65-8895-4613-a886-a9ec22111207
Firefox 7.0.1 Crash Report [@ js::Bindings::getLocalNameArray(JSContext*, js::Vector<JSAtom*, int, js::TempAllocPolicy>*) ]
This is probably caused by or related to a "Frankenstein-build"; an update or system restore went wrong so some files belong to Firefox 7 and some belong to Firefox 8
You can try to solve this by deleting your current Firefox and downloading and installing a new fresh copy
See http://support.mozilla.com/en-US/kb/latest-firefox-issues