Firefox opens in full screen and I can't do anything at all except Ctrl-alt-delete and closing of Firefox!

Hello. I made a stupid mistake and installed an add-on or extension (do not know which) that I was hoping would allow me to display YouTube videos in full screen. Unfortunately I don't remember the name of the add-on/extension.

The problem is, now everytime I open Firefox, it opens in the mode "full screen" and ANYTHING (including F11) will allow me to access the taskbar, the address bar or an other controls Firefox. I can nothing at all, but display the homepage fullscreen! The only option I have is to hit CTRL-alt-del and close Firefox.

I tried to uninstall and reinstall Firefox and this does not solve the problem. Help, please. Thank you!

P.S. I write this in Internet Explorer as I can't currently use Firefox.

Try to rename (or delete) the file xulstore.json in the Firefox profile folder.

You can check if you can start Firefox in Safe Mode by holding down the shift/Options key.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem.

  • Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance
  • Do NOT click on the reset button on the startup window Mode safe

Tags: Firefox

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