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Type eror components classes (cid) is underfined

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Java Script Application Type Error components classes (cid) is undefined. I have a mac book running version OS X 10.5.8. I recently installed the latest version of firefox on my laptop and now getting this error everytime opening firefox.

Java Script Application Type Error components classes (cid) is undefined. I have a mac book running version OS X 10.5.8. I recently installed the latest version of firefox on my laptop and now getting this error everytime opening firefox.

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Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...