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Exc in ev handl: Error: Bad NPObject as private data!

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Just updated to FF 3.6.23. Running on Vista Business Premium. Now, each time FF accesses a new page, it displays this error message: "Exc in ev handl: Error: Bad NPObject as private data!" with an OK button to be clicked before page will load. EVERY PAGE.

Just updated to FF 3.6.23. Running on Vista Business Premium. Now, each time FF accesses a new page, it displays this error message: "Exc in ev handl: Error: Bad NPObject as private data!" with an OK button to be clicked before page will load. EVERY PAGE.

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see http://kb.mozillazine.org/Problematic_extensions and then the problem statement and solution for Site Advisor.

Hi Ritchie. I've uninstalled McAfee Site Advisor and all is well. I've also bookmarked that "problematic extensions" page in case similar questions arise in the future. Thanks for the prompt and effective reply.