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Your problem is kinda…vague. You tried running it in its safe mode? I'm going to assume you have the latest, which is what I think I have here. Safe mode should turn off all the plugins. If you can get safe mode to run, trying uninstalling any recent extensions you downloaded. If that still doesn't help, try uninstalling it and reinstalling? Mmm.
You could try stuff like different profiles, and trying to recall what you did last time it worked would help too.