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This is the error I always get. How to solve this? "Exc in ev handl: Error: Bad NPObject as private data!"

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This error occurs 50% of the time I use Firefox. It comes up in a small window saying and when I click ok the window will close and another one will open. I thought updating will solve but no. Kindly help me solve.

This error occurs 50% of the time I use Firefox. It comes up in a small window saying and when I click ok the window will close and another one will open. I thought updating will solve but no. Kindly help me solve.

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That issue can be caused by the McAfee Site Advisor extension

Start Firefox in Safe Mode 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).