

The solution is to remove the Firefox program and then reinstall Firefox. This error is caused by a problem with Firefox program files. See How to run Firefox when your profile is missing or inaccessible for solutions. See "Firefox is already running but is not responding" error - How to fix for solutions. If you get the " Mozilla Crash Reporter" window when you start Firefox, see Troubleshoot Firefox crashes (closing or quitting unexpectedly) for solutions.įirefox is already running but is not responding Specific error messages Mozilla Crash Reporter 2.4 Firefox will not start because of missing libraries.2.2 Firefox will not start after installing add-ons.2.1 Firefox will not start due to security software.1.6 There was an error launching the application.1.4 Failed to read the configuration file.1.3 Your Firefox profile cannot be loaded.

