

When the Firefox Safe Mode window appears, select "Start in Safe Mode". (you may need to specify the Firefox installation path e.g. On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode.On Mac: Hold the option key while starting Firefox.On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.If Firefox is not running, you can start Firefox in Safe Mode as follows: Click the menu button, click Help and select Restart with Add-ons Disabled.If Firefox is open, you can restart in Firefox Safe Mode from the Help menu: Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).


If that doesn't help, and you have other add-ons, try Firefox Safe Mode to see if the problem goes away. Try disabling it to test - Add-ons Manager (Ctrl+Shift+A) > Appearance. Hi, it's likely that your theme now has a compatibility issue with Firefox.
