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.

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

I keep getting a pop-up window from firefox that says, "Firefox is already running, but is not responding. To open a new window, you must first close the wxisting process or restart your system

  • 1 cavab
  • 5 have this problem
  • 11 views
  • Last reply by cor-el

more options

I keep getting a pop-up window from firefox that says, "Firefox is already running, but is not responding. To open a new window, you must first close the existing process or restart your system

I keep getting a pop-up window from firefox that says, "Firefox is already running, but is not responding. To open a new window, you must first close the existing process or restart your system

All Replies (1)

more options