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.

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

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

On starting Firefox, I get the message 'Firefox is already running', which it is not.

  • 1 amsa
  • 0 sa na da wannan matsala
  • 1 view
  • Amsa ta ƙarshe daga Terry

isco
isco
more options

On starting Firefox, I get the message 'Firefox is already running', which it is not. I have tried uninstalling and re-installation but always with the same result. What is the solution please? This started yesterday afternoon (UK 04Feb2023. Version 109.0.1, first offered to Release channel users on January 31, 20234Feb23)

On starting Firefox, I get the message 'Firefox is already running', which it is not. I have tried uninstalling and re-installation but always with the same result. What is the solution please? This started yesterday afternoon (UK 04Feb2023. Version 109.0.1, first offered to Release channel users on January 31, 20234Feb23)

All Replies (1)

Terry
Terry
more options

You may need to remove a lock file.

https://support.mozilla.org/en-US/kb/Firefox-already-running-not-responding