What happens if you try to use the clipboard ? Is this only with copy or with paste as well ?

Try to use keyboard shortcuts in case the buttons on the webpage or other methods aren't working.

• Copy: Ctrl+C or Ctrl+Insert (Mac: Command+C)
• Paste: Ctrl+V or Shift+Insert (Mac: Command+V)
• Cut: Ctrl+X or Shift+Delete (Mac: Command+X)

I'm having this problem too. I have no trouble pasting into Firefox - I just cannot copy from Firefox (whether through keyboard shortcuts, context menu or main menu. I noticed the problem when trying to copy from the address bar, but I also have not been able to copy from any web page that I've tried. I did verify that I can do this from other browsers.

I have tried the following:

• Restart
• Refresh
• Reinstall