gistfile1.txt

// ==UserScript==
// @name           Mylist unwatch count
// @namespace      http://web.zgo.jp/
// @include        http://www.nicovideo.jp/mylist/*
// ==/UserScript==
(function() {
  unsafeWindow.document.watch('title',
  function(id, before, after) {
    updateFavicon();
    return after
  });
  var favicon = document.evaluate('//head/link[@rel="shortcut icon"]', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
  var canvas = document.createElement('canvas');
 var head = document.getElementsByTagName('head')[0];

  function updateFavicon() {
    var unread = document.evaluate('id("mylists")//tbody//tr', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).snapshotLength;
    GM_log(unread);
    canvas.width = canvas.height = 16;
    with(canvas.getContext('2d')) {
      clearRect(0, 0, 16, 16);
      mozTextStyle = 22 + (unread.toString().length) * -4 + "px sans-serif";
      translate(0, 14);
      mozDrawText(unread);
    }
    favicon.href = canvas.toDataURL();
    head.appendChild(favicon);

  }
})();
//.user.js