I just upgraded to Firefox 4 and I get this error window that displays off and on screen this what I can read " ug-in object: TypeError:" and the second line "id] is undefined" but when I click the OK button the Firefox opens ok. What's wrong?

I'm running Mac OS 10.6

I also have the same issue with McAfee SiteAdvisor and FF4 on a MacBook Pro running the latest version of Snow Leopard. I have put in a service request with McAfee and will update this post in approx 48 hours unless they respond sooner. Seems like a far to common app to somehow have "missed" testing on a browser release that was scheduled for a while.

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