Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

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