gistfile1.txt

  var REPLACE_CONTENT = true;
  var URL_LIST = [
  /^http:\/\/tinyurl\.com\//,
  /^http:\/\/(?:.*?\.)?zz\.tc\/.+/
  ];

  var requested = {};
  document.addEventListener('mouseover',
  function(e) {
    var elem = e.target.wrappedJSObject;
    if (requested[elem] == undefined && elem.hasAttribute('href')) {
      if (!URL_LIST.some(function(re) re.test(elem.href))) return;
      requested[elem] = true;
      GM_xmlhttpRequest({
        method: 'get',
        url: elem.href,
        onload: function({
          finalUrl: url
        }) {
          elem.href = url;
          if (REPLACE_CONTENT) {
            elem.textContent = url;
          } else {
            elem.title = url;
          }
        },
        onerror: function() {
          delete requested[elem];
        }
      });
    }
  },
  false);