I know this won't help your Firefox problem, but I would suggest at least considering switching to Chrome. I did just two or three months ago after using Firefox for years and years. The reason? Firefox updates all the time, and it had become extremely slow with some flash-driven or media-heavy websites. It takes barely any time for me to load Chrome versus Firefox. Now, one difference is that Chrome opens up several little processes on my computer, thus using more resources than Firefox, but at least they're spread around, unlike Firefox, which hoards all of its resources in one location and then overloads.
Anyway, that said, if Firefox crashes and can't send an error report, why not try redownloading Firefox?
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