I get the following message when I try to open firefox 5: TypeError: Components.classes[cid] is undefined. Is there a way to fix this?

as above

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

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I get the following message when I try to open firefox 5: TypeError: Components.classes[cid] is undefined. Is there a way to fix this?

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