make all links open in new tab

.js

function convertLinks() {
  console.log('convertLinks()');
  var links = document.getElementsByTagName('a');
  for (var i = 0; i < links.length; i++){
    links[i].setAttribute('target', '_blank');
  }
}
convertLinks();
// window.onload = convertLinks;
// element.addEventListener('DOMNodeInserted', convertLinks, false);