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

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. How do I fix this? I am ready to go back to internet explorer!

  • 1 reply
  • 3 have this problem
  • 1 view
  • Last reply by m-wynn

more options

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

This box appears and then firefox quits...never opens. I have uninstalled, and loaded firefox 5 times and never got it to run.

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. This box appears and then firefox quits...never opens. I have uninstalled, and loaded firefox 5 times and never got it to run.

All Replies (1)

more options