How can I cure/stop this error message on startup 'Exc in ev handl: TypeError: this.oRoot.enable is not a function'

When starting Firefox 8.0, I get the above JavaScript Application error. When I click 'OK' in dialogue box, Firefox appears to start normally.
What could be the cause, and how can I cure it?

This issue can be caused by the McAfee Site Advisor extension
* https://community.mcafee.com/message/203466
Start Firefox in Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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