Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

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
This thread was archived. Please ask a new question if you need help.
Archived

I cannot use firefox because of the error:

Firefox Performance and connectivity
cor-el replied 1 year ago
Roger Ulrich
Roger Ulrich

Whenever I try to use firefox I get the message:

Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.

There is no firefox running and all I can do is close the windows. Pressing the on-screen button "Close Firefox" does nothing except for the error message to be reposted. I have to press the upper-right X to close the window.

Whenever I try to use firefox I get the message: Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. There is no firefox running and all I can do is close the windows. Pressing the on-screen button "Close Firefox" does nothing except for the error message to be reposted. I have to press the upper-right X to close the window.

All Replies (1)

cor-el
cor-el
  • Moderator

You can check this article.