Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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 won't start after it has been closed down. Why is this?

  • 1 reply
  • 17 have this problem
  • 12 views
  • Last reply by cor-el

more options

After I close Firefox I sometimes get the following message when I try to restart. 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." The Windows Task manager insists there is no Firefox process or application running. Why is this?

After I close Firefox I sometimes get the following message when I try to restart. ''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." The Windows Task manager insists there is no Firefox process or application running. Why is this?

All Replies (1)

more options