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Does anyone know why my W key doesn't work only in Firefox?

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I installed Firefox on my laptop and the only thing I did was install flash and now my W key doesn't work. I'm not sure if it worked on Firefox before I installed flash. But the W key works in every other browser so I'm unsure whats wrong.

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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do not click the Reset button on the Safe mode start window or otherwise make changes.
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I started it in safe mode and the W key doesn't work still. Its seemingly as far as I can tell the only key that doesn't work.