Unity Player Crashes ONLY on Firefox after migration

I recently got an SSD and reinstalled Windows 7 on it. Now Unity Web Player is crashing when I go into full-screen mode on Firefox ONLY. Internet Explorer and Chrome are both working ok.

The issue is probably that Firefox was a new install, but I migrated the extensions and settings using a program (don't remember the name, it generated a .pcv file). I really don't want to reinstall all my Firefox extensions, lose all my settings & bookmarks if I can avoid it...

Any way to just clean out everything to do with the web player's integration with Firefox and start fresh? I tried the clean database thing, but anything's worth another shot as long as I don't have to redo my extension settings.

Regards,

Flamesilver