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C and H keys won't work unless I use the shift button. How can I fix this?

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Now the 'V' button no longer works unless I use the shift key. I do not enjoy having to switch back and forth between cap-locks on and cap-locks off.

Now the 'V' button no longer works unless I use the shift key. I do not enjoy having to switch back and forth between cap-locks on and cap-locks off.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See:

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")