according to the EULA one needs written permission by Google to redistribute the 4 lines of code in the ADD-ON:
(function(){var a=document.createElement("script");
a.type="text/javascript";a.id="__gaOptOutExtension";
a.innerText='window["_gaUserPrefs"] = { ioo : function() { return true; } }';
document.documentElement.insertBefore(a,document.documentElement.firstChild);})()
maybe one can recreate a clean-room implementation of it to get it on AMO? that would be awesome!
above 4 lines set a variable, which a webserver can reset. GA scripts will be loaded and executed unimpeded by the variable. This is the original sin.
more info & suggestions to counteract G.A.: hackademix