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 5 Claims it is already running on Open -Win7

  • 1 reply
  • 4 have this problem
  • 2 views
  • Last reply by dynamite

more options

Setting up a new DELL Win7 Prof. System. Downloaded latest 5.x. Ran fine once. Now upon clicking the Firefox Icon get the following window message:

"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."

- No firefox labeled process shows in task manager. - Re-start same message. - Uninstall/ reinstall same message. No Joy.........

Setting up a new DELL Win7 Prof. System. Downloaded latest 5.x. Ran fine once. Now upon clicking the Firefox Icon get the following window message: "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." - No firefox labeled process shows in task manager. - Re-start same message. - Uninstall/ reinstall same message. No Joy.........

All Replies (1)

more options

See if the solutions given in this article help: "Firefox is already running but is not responding" error - How to fix.