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

This thread was archived. اگر به کمک نیاز دارید لطفاً یک سؤال بپرسید.

Firefox will not open after being installed

  • 1 پاسخ
  • 1 has this problem
  • 1 view
  • آخرین پاسخ توسّط leenerak

Bri3199
Bri3199
more options

Recently I was having problems in installing add-ons to firefox. So I uninstalled firefox and have reinstalled it. However now when I click on firefox I get a message saying 'close firefox. A copy of firefox is already open. Only one copy of firefox can be open at a time'. Any suggestions on how to fix this please. Thanks

Recently I was having problems in installing add-ons to firefox. So I uninstalled firefox and have reinstalled it. However now when I click on firefox I get a message saying 'close firefox. A copy of firefox is already open. Only one copy of firefox can be open at a time'. Any suggestions on how to fix this please. Thanks

All Replies (1)

leenerak
leenerak
more options

Hi, This problem happens when firefox has not completely shut down and remains in memory. Either restart the computer or stop the firefox processes running.

For more information see the "Hang at exit" section of Firefox hangs or is not responding - How to fix

If you are still having some trouble with your add-ons, perhaps this section could be of use: Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems As detailed in the write up, you can try firefox safe mode and see if the problem still occurs.

Hope this helps