Before the opening of Firefox, I get a window: application JavaScript Exc hand ev: TypeError: This.oRoot.enable is not a function. I have to click ok and then open Firefox

I click on Firefox to open the browser.
Browser does not open.
I get a little window:
(JavaScript application)
EXC in hand ev: TypeError: This.oRoot.enable is not a function
Ok
I have to click OK and then the browser opens.
How can I get away with this?
I use 3.6.11
Edition 6 created a lot of trouble with printing using Lexmark
Help, please.

This problem may be caused by the extension of McAfee Site Advisor

Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the extensions of the origin of the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > appearance/themes).

Tags: Firefox

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