Getting an error message: Exc in EV Handl:Type error:This oRoot.enable is not a function on FF6 start.

I'm getting the above message when I start FF6. Didn't have it when I first downloaded. I was renewing my First Mailwasher subscription when I first encountered it. I deleted FF6 and reloaded but this did not correct the problem. FF6 works fine after the error message. On sites with aggressive pop-ups I get the error message and when I go ok to clear the message the pop-up loads minimized. All other computer functions appear ok.

Troubleshooting plugins
* https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins
Check and tell if its working.

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

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    That problem is probably caused by McAfee Site Advisor
    *https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
    Start Firefox in <u>[[Safe Mode]]</u> 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).
    *Don't make any changes on the Safe mode start window.
    *https://support.mozilla.com/kb/Safe+Mode

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