// Find all the <a> links within the document
  var a = document.getElementsByTagName(“a”);
  for ( var i = 0; i < a.length; i++ ) {
  
      // Create an image of the linked-to site’s favicon
      var img = document.createElement(“img”);
      img.src = a[i].href.split('/').splice(0,3).join('/') + '/favicon.ico';
  
      // Insert the image before the link
      a[i].parentNode.insertBefore( img, a[i] );
  
  }