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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 http://kb.mozillazine.org/Problematic_extensions 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 http://www.siteadvisor.com/ 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.