Firefox won't launch 90% of the time even though Internet Explorer does all the time
Why doesn' Firefox launch? It's my default browser. Internet Explorer always launches when asked.
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One of your add-ons might be the culprit. Try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If that solves the problem, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and possibly Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
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If that does not solve the problem, a new profile Then, Recover your data from the old profile. See http://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile
Also see Firefox will not Start