player/js/utils/featureSupport.js

var featureSupport = (function(){
    var ob = {
        maskType: true
    };
    if (/MSIE 10/i.test(navigator.userAgent) || /MSIE 9/i.test(navigator.userAgent) || /rv:11.0/i.test(navigator.userAgent) || /Edge\/\d./i.test(navigator.userAgent)) {
       ob.maskType = false;
    }
    return ob;
}());