This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Firefox is already running but not responding,No process in task manager,Restart and uninstall not useful.Profile manager error

  • 5 uphendule
  • 22 zinale nkinga
  • 6543 views
  • Igcine ukuphendulwa ngu cor-el

Quinn777
Quinn777
more options

So one day when I opened my mozilla firefox Ive got the "Firefox is already running but not responding.To open a new window,you must first close the existing firefox process,or restart your system." So I checked my task manager but there is no process,I then checked hours in the internet to find a solution.Yes,I also checked for solutions in this site.Then,I try uninstalling and restarting,it also didn't work,Next I also tried downloading profilemanager and tried to run it but as unlucky as I can be,it also didn't work. Please help :(

So one day when I opened my mozilla firefox Ive got the "Firefox is already running but not responding.To open a new window,you must first close the existing firefox process,or restart your system." So I checked my task manager but there is no process,I then checked hours in the internet to find a solution.Yes,I also checked for solutions in this site.Then,I try uninstalling and restarting,it also didn't work,Next I also tried downloading profilemanager and tried to run it but as unlucky as I can be,it also didn't work. Please help :(

All Replies (5)

iamjayakumars
iamjayakumars
more options

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

  1. Go to Firefox > Help > Troubleshooting Information.
  2. Click the "Reset Firefox" button.
  3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
  4. Firefox will open with all factory defaults applied.


Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Okulungisiwe ngu iamjayakumars

Quinn777
Quinn777 Umnikazi wombuzo
more options

My firefox keeps giving me the "Firefox is already running but not responding" notice so I can't open the browser,thus unabling myself to use your recommended solution. If you can,could you please give me another solutions? Thx :(

iamjayakumars
iamjayakumars
more options

Goto File > Quit

Quinn777
Quinn777 Umnikazi wombuzo
more options

where can I find this file->quit?

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

This can happen when the profile that is marked in the profiles.ini file as Default=1 is missing or otherwise can't be used.

If there is still a profiles.ini file, but the profile folder is gone then delete the profiles.ini file to force Firefox to create a new default profile.
Otherwise you can create a new profile and use "Choose Folder" to recover an existing profile.