We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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 not opening

  • 1 reply
  • 1 has this problem
  • 2 views
  • Last reply by FredMcD

more options

Hi, all of a sudden the Firefox app doesn't work on my pc. An error shows up saying "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window". Have tried uninstalling it, removing the Firefox folders, refreshing it and changing the profiles but nothing works. Any other suggestions?

Hi, all of a sudden the Firefox app doesn't work on my pc. An error shows up saying "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window". Have tried uninstalling it, removing the Firefox folders, refreshing it and changing the profiles but nothing works. Any other suggestions?

All Replies (1)

more options