20.0.1: file == > new window & private in new window only will not open then Firefox will not stop running when the application is closed

Although nothing seems to happen when clicking new window or new private window, there seems to be some process started because when I try to close Firefox and reopen it, I get an error message saying that Firefox is already running. My only option then is to stop the process through the Task Manager. I tried (many times) to uninstall and reinstall.

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 (switch to the DEFAULT theme: Firefox/tools > Modules > appearance).

  • Do NOT click on the reset button on the startup window Mode safe or make changes.

Create a new profile as a test to see if your profile is the source of the problems.

See "create a profile":

If the new profile works then you can transfer files from a profile in the new profile, but make sure not to copy corrupted files.

Tags: Firefox

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