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

Cannot open Firefox

  • 1 پاسخ
  • 0 have this problem
  • 1 view
  • آخرین پاسخ توسّط Terry

more options

I cannot open Firefox. Error message appears: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window."

Task Manager always shows three active Firefox Apps, but ending those tasks does not help. I don't see any other active Mozilla procces on the list

I have uninstalled and reinstalled Firefox from MS Store but that does not help either.

I cannot open Firefox. Error message appears: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." Task Manager always shows three active Firefox Apps, but ending those tasks does not help. I don't see any other active Mozilla procces on the list I have uninstalled and reinstalled Firefox from MS Store but that does not help either.

All Replies (1)

more options