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

why do I get this error message after I log off then try to log back on: 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.

Why do I get this error message when I try to re-log on to Firefox when I have already log off? 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 only way I can re-log on to Firefox is to restart my computer.

Why do I get this error message when I try to re-log on to Firefox when I have already log off? 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 only way I can re-log on to Firefox is to restart my computer.

All Replies (1)

It sounds as though Firefox is not shutting down completely. Check the "Hang at exit" section of this article for troubleshooting suggestions: http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit