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Using 3.6.21, get pop up error moving from site to site of JavaScript application Exc in ev handl:error:bad NPObject as private data

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GardenPete
GardenPete
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Using 3.6.21, get pop up error box when moving from site to site. It is headed JavaScript application and says Exc in ev handl:error:bad NPObject as private data .

Using 3.6.21, get pop up error box when moving from site to site. It is headed JavaScript application and says Exc in ev handl:error:bad NPObject as private data .

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cor-el
cor-el
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This issue can be caused by the McAfee Site Advisor

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