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Why am I getting this error message when I close some web pages? Exc in ev handl: Error: Bad NPObject as private data!

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This error message recently started popping up periodically on web pages that seem to have graphics or photos. There have been recent Adobe updates, but I can't verify which ones and whether they are the issue. On the other hand a recent Firefox update 7.0.1 indicated it was incompatible with a number of plug-ins? Could that be the source. Incidentally after I receive the message: it comes on twice, I am returned to a previous screen without further problem.

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Please see solution in for "McAfee Site Advisor".

(Windows): For best results you should uninstall McAfee Site Advisor from Control Panel > add/change programs (Programs and Features). Reboot the system. Then Reinstall from and reboot the system. When installing refuse other suggested (crapware) applications.

Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.