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!

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

Unable to start Firefox

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by kobe

more options

Hi, when trying to start Firefox, I get the message 'Process is already running.....'

1) The process is not running I have checked. 2) I have rebooted (numerous times.) 3) I have uninstalled Firefox and reinstalled and rebooted and the message still appears. 4) I have tried to find my lock file and have no idea what Charms are (Mozilla advice on finding the file to delete by hovering in the bottom right of the screen.) 5) I have entered the appdata string in my Start/Search and nothing is found.

Hi, when trying to start Firefox, I get the message 'Process is already running.....' 1) The process is not running I have checked. 2) I have rebooted (numerous times.) 3) I have uninstalled Firefox and reinstalled and rebooted and the message still appears. 4) I have tried to find my lock file and have no idea what Charms are (Mozilla advice on finding the file to delete by hovering in the bottom right of the screen.) 5) I have entered the appdata string in my Start/Search and nothing is found.

All Replies (1)

more options