window.addEventListener("click", (e) => {
  var target = e.target;
  while ((target.tagName != "A" || !target.href) && target.parentNode) {
    target = target.parentNode;
  }
  if (target.tagName != "A" || target.href.indexOf('youtube') == -1) 
    return;

  e.preventDefault();
  browser.runtime.sendMessage({"youtubeUrl": target.href, "targetName": (target.attributes.target != null ? target.attributes.target.nodeValue : '_self')});
});