Firefox crashing with no add-ons or plug-ins

Yesterday, I removed all of my add-ons and deleted all of my plug-ins except for Mozilla Default. Firefox ran smoothly all day yesterday after that. Now today, it's beginning crashing again. (RtlpWaitForCriticalSection | RtlEnterCriticalSection) is the signature of the crash. I don't know what's causing this at all. There is nothing left that could be contributing to this as far as I can tell.
== Crash ID(s) ==
2b285d73-4386-4bcf-8755-742722100729, 8b3a715c-6f1c-45b0-8057-ce9f92100729

Please read this article to see if it helps:
http://support.mozilla.com/en-US/kb/Crash+signature+-+RtlpWaitForCriticalSection

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