Why does my firefox intermittently (and seemingly randomly) behave as though my control key is stuck on, even though my keyboard behaves normally in every other program? AND it will also randomly change my keyboard mapping to an international one.

I will be using firefox, and for some reason, it behaves as though control key is being held down. If i use the mouse wheel, the page zooms. If I press the letter 'o', the "Open file..." dialog opens. But I'm not holding control. If, while this is happening, I switch to another application like Notepad, it behaves normally. But then I'll go back to firefox and the problem is still there. It seems to randomly start and stop.
Also, in a possibly related problem, my keyboard mapping will change from my default US to some other foreign mapping where shift-6 incorrectly outputs '?' instead of '^', for example.

I will be using firefox, and for some reason, it behaves as though control key is being held down. If i use the mouse wheel, the page zooms. If I press the letter 'o', the "Open file..." dialog opens. But I'm not holding control. If, while this is happening, I switch to another application like Notepad, it behaves normally. But then I'll go back to firefox and the problem is still there. It seems to randomly start and stop.
Also, in a possibly related problem, my keyboard mapping will change from my default US to some other foreign mapping where shift-6 incorrectly outputs '?' instead of '^', for example.

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