>>343-344
(function() {
  window.addEventListener('load', function(){

    /*開始*/
    var start = new Date();

    const PATTERN = {
    __proto__: null,
    'firefox' : 'ファイアーフォックス'
    };

    const PATTERN_SHORTCUT = RegExp([x for (x in PATTERN)].join('|'), 'gi');

    replace(document);

    document.addEventListener('DOMNodeInserted', function(event) {
      replace(event.target);
    }, false);

    function replace(target) {
      target.normalize();
      var x = document.evaluate('descendant::text()', target, null, 6, null);
      for (var i = 0, len = x.snapshotLength; i < len; i++) {
        var textNode = x.snapshotItem(i);
        textNode.nodeValue = textNode.nodeValue.replace(PATTERN_SHORTCUT, function($0) PATTERN[$0.toLowerCase()]);
      }
    }