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How do I get rid of: Exc in ev handl: TypeError: this.oRoot.enable is not a function

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When I go into any change, I get the above. How do I get rid of it, please.

When I go into any change, I get the above. How do I get rid of it, please.

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This issue can be caused by the McAfee Site Advisor extension


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).