Error opening FF 8 "TypeError: Components.classes[cid] is unidefined"

I've just upgraded from FF 3.6 to FF 8. Every time I open FF 8, I get this error dialog box:
[JavaScript Application]
TypeError: Components.classes[cid] is unidefined
I just performed the upgrade, so haven't used FF 8 enough yet to know if the error causes any problems.
Thanks for your assistance.

That 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 or if hardware acceleration 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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