Export any personalization you've done to Firefox (extensions, bookmarks, etc) and try reinstalling Fx.
If that doesn't work, you can fairly safely assume the build you're downloading has some compatibility issues with your OS.
Try Redlemon's solution first, though. I don't have any experience with profiles, but it sounds like it might help avoid reinstallation.
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"I will accept the rules that you feel necessary to your freedom. I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do."
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