Force unbind of all eventlisteners by loading a new empty document and waiting for it to be loaded

function removeIframe(frame, cb) {
  var emptyHtmlPage = "data:text/html;charset=utf-8;base64,PGh0bWw+PGJvZHk+PC9ib2R5PjwvaHRtbD4=";
  frame.setAttribute("src", emptyHtmlPage);
  frame.addEventListener("load", function() {
    frame.parentElement.removeChild(frame);
    if (cb) {
        cb();
    }
  });
}