Firefox closes in regular and safe mode on startup AND does not submit a crash report.

Here's what I know. Every time I open Windows (looks like Windows 7 SP, 64 bit) and open Firefox (15.0.1), my browser closes within a few seconds. Sometimes, it seems this is precipitated by navigating to a new page, but I can't say that for sure. After closing, I can re-open it and run it just fine. However, as it does this every time on the first load, it is really annoying.
I have tried putting it in safe mode, but that makes no difference. I have scanned for viruses and malware. After removing the 1 thing I found, I still continue to have this problem. There are no crash reports submitted when this happens. Thoughts?

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that works.

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