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Firefox is already running but not responding

If you are getting the below error when you launched Firefox browser then read on how to fix this problem. The error says  ‘Firefox is already running, but not responding. To open a new window, you must close the existing Firefox process, or restart your system‘.

Firefox launch error already running

How to fix this error?:

  • You can get rid of the problem by doing the following easy steps.
  • Open Task Manager application. (This can be done either by running ‘taskmgr‘ from Run window or by right clicking on the taskbar and selecting ‘Start Task Manager‘ option.)
  • Click on Processes tab in task manager.
  • Locate and select the process with the image name firefox(You can sort the list by clicking on image name if it’s not already sorted).
  • Click on the button ‘End Process’

Kill firefox process from task manager

  • You will be asked ‘Do you want to end Firefox’?Want to end firefox
  • Click on ‘End process’.
  • Launch Firefox browser now and it would open without any issues.
{ 1 comment… add one }
  • mav1c April 23, 2012, 1:42 pm

    This works once. If you close Firefox, and try to restart, the error appears again. You then have to run through these steps to start it. Happens every time. What I want to know is, how do you prevent the error from reappearing every time Firefox is closed and attempted to run again?

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