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.

Try to delete the mimeTypes.rdf file in the Firefox Profile Folder.
* http://kb.mozillazine.org/mimeTypes.rdf
* http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions
You can use this button to go to the Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Open Containing Folder

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http://support.apple.com/kb/TS3297
"Error 499"
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