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Firefox is already installed but unable to launch !

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  • Lêste antwurd fan Anush A

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Hi,

Suddenly Firefox has stopped launching. Each time I click to launch a dialogue box appear reading: "Firefox is already running, but is not responding. To open a new window, please close the existing Firefox process or restart your system". But this does not work. The issue persist in my user account (Right now I am using my administrator account), each time switch between user to administrator - I don't like.

What can I do ? Any suggestion, Please...

Regards,

Solvemachine

Hi, Suddenly Firefox has stopped launching. Each time I click to launch a dialogue box appear reading: "Firefox is already running, but is not responding. To open a new window, please close the existing Firefox process or restart your system". But this does not work. The issue persist in my user account (Right now I am using my administrator account), each time switch between user to administrator - I don't like. What can I do ? Any suggestion, Please... Regards, Solvemachine

Keazen oplossing

Can you try to close the running instance of Firefox in Windows using the Windows Task Manager, and try running it.

If that dosent Work, Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings and disables most add-ons (extensions and themes).

(If you're using an added theme, switch to the Default theme.)

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu by clicking on the Restart with Add-ons Disabled... menu item:
FirefoxSafeMode

If Firefox is not running, you can start Firefox in Safe Mode as follows:

  • On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
  • On Mac: Hold the option key while starting Firefox.
  • On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
    (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

Once you get the pop-up, just select "'Start in Safe Mode" Safe Mode Fx 15 - Win

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Thank you.

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Keazen oplossing

Can you try to close the running instance of Firefox in Windows using the Windows Task Manager, and try running it.

If that dosent Work, Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings and disables most add-ons (extensions and themes).

(If you're using an added theme, switch to the Default theme.)

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu by clicking on the Restart with Add-ons Disabled... menu item:
FirefoxSafeMode

If Firefox is not running, you can start Firefox in Safe Mode as follows:

  • On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
  • On Mac: Hold the option key while starting Firefox.
  • On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
    (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

Once you get the pop-up, just select "'Start in Safe Mode" Safe Mode Fx 15 - Win

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Thank you.