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

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I am getting this error message whenever Firefox is opening up a page. How can i remove it?

I am getting this error message whenever Firefox is opening up a page. How can i remove it?

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That issue can be caused by the McAfee Site Advisor extension


Start Firefox in Use Troubleshoot Mode in Firefox to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).