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I can't get Firefox to open on my computer. I've been using it for a year and a half with no problems until now. I keep getting the following "Unresponsive script" error message: Script: resource:///components/nsHandlerService.js:432 How do I fix this?


Unresponsive script error message keeps popping up, Firefox will not open.

Additional System Details

Crash ID

Script: resource:///components/nsHandlerService.js:432

Installed Plug-ins



  • User Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.21022; .NET CLR 3.5.30729; MDDC; .NET CLR 3.0.30729; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; .NET4.0C; FDM; lib/5.0\0287; runtime 11.00287; 89770603)

More Information

  • Top 10 Contributor
  • Moderator
10756 solutions 96800 answers

Try to delete the mimeTypes.rdf file in the Firefox Profile Folder.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Open Containing Folder