Popup-Fenster "kein Flashplugin installiert" unterdrücken

// ==UserScript==
// @name      Flash-Meldung aus
// @run-at    document-start
// @include   http://*.mopo.de/*
// ==/UserScript==


var str = 'alert("Kein Flash Plugin installiert.")';


function onBeforeSE(event) {
   var scriptA = event.target;
   if (scriptA.innerHTML.contains(str)) {
      event.preventDefault();
		var scriptB = document.createElement('script');
		scriptB.innerHTML = scriptA.innerHTML.replace(str, '{ }', 'g');
		scriptA.parentNode.insertBefore(scriptB, scriptA.nextSibling);
   };
};


window.addEventListener('beforescriptexecute', onBeforeSE);


window.addEventListener('load', function onLoad() {
   window.removeEventListener('load', onLoad);
   window.removeEventListener('beforescriptexecute', onBeforeSE);
});