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Keyboard not working when Firefox opens from a link

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Hello Firefox community, I'm having a problem where, when I click a link (in a pdf, specifically), Firefox opens like usual but for some reason, my keyboard gets disabled. I can click and navigate through pages that way, but I cannot type anything in the search bar, nor in programs (such as Drive). Does anybody know what I can do to fix this?

Hello Firefox community, I'm having a problem where, when I click a link (in a pdf, specifically), Firefox opens like usual but for some reason, my keyboard gets disabled. I can click and navigate through pages that way, but I cannot type anything in the search bar, nor in programs (such as Drive). Does anybody know what I can do to fix this?

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Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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I don't have control over how Firefox opens automatically when I click a link in a pdf (saved to my laptop, not online), so I don't have a chance to start the browser in Safemode. When I start firefox normally, I don't experience any problems.