Firefox cannot find a file at the jar! file on start up Why and what does this mean

When i launch the new firefox 4 I get an error page titled
problem loading page - with this message
File not found
Firefox can't find the file at jar:file:///Applications/Firefox.app/Contents/MacOS/omni.jar!/browserconfig.properties.
Check the file name for capitalization or other typing errors.
Check to see if the file was moved, renamed or deleted.
Why and how do i fix it I have tried reinstalling the program once.

This issue can be caused by an extension that isn't working properly.
Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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https://discussions.apple.com/thread/2769294
http://realitypod.com/category/hacks-and-cracks/mac-hacks-and-cracks/
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Firefox cannot find a file at the jar! file on start up Why and what does this mean

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