function dynamicallyLoadScriptInTopWindow(url) {
  var script = document.createElement("script");
  script.src = url;
  window.top.document.head.appendChild(script);
}

console.log("loading jquery");
dynamicallyLoadScriptInTopWindow("https://code.jquery.com/jquery-1.10.2.js");

var scriptURL = "https://botcompany.de/1026221/raw";
console.log("trying to load: " + scriptURL);  
dynamicallyLoadScriptInTopWindow(scriptURL);
console.log("added top-level script");

Began life as a copy of #1026227