After updating and loading message apears windw "TypeError: components.classes['@ [cid] is undefined" why and what to do?

After the upgrade to Firefox 6.0
After opening
a small error window opens with the message
TypeError: Components.classes['@ [cid] is undefined

This problem may be caused by an extension that is not working properly.

Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the extensions of the origin of the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > appearance/themes).

Tags: Firefox

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