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I'm running Linux Mint KDE and have been having an issue with Firefox lately. When I attempt to open the the Firefox menu (the one on the right with 3 bars), clicking has no effect.

Pressing alt opens the more traditional file menus so I am able to access everything that way. However I would prefer if Firefox functioned as intended.

I searched the Firefox website for people having similar problems, but the answers on how to fix it have varied. I've tried the following but none of them have worked:

  • Starting in safe-mode
  • Refreshing Firefox
  • Using the default theme (I already was)
  • Disabling hardware acceleration
  • Running Firefox from command-line and looking for errors (there were none)
  • renaming ~/.mozilla and reopening firefox
  • apt purge firefox and reinstalling

Does anyone have any other suggestions?

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The answer turns out to be related to another question I asked - composting. To fix withing KDE I needed to turn off composting by pressing:

CtrlShiftF12

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  • This seems to not be a general consequence of compositing. I can access ☰ in Firefox with or without compositing on Kubuntu 18.04. – Justice for Monica Feb 2 at 2:19

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