Get a list of globals added to window.

globalList.js

(function iffe() {
  var body = document.body;
  var frm = document.createElement('iframe')
  body.appendChild(frm);
  function checkFrm(i) {
    return !!frm.contentWindow[i] && i !== 'checkFrm';
  }
  var result = Object.keys(window).filter(checkFrm);
  body.removeChild(frm);
  console.log(result);
})();