firefox cookieswap userscript userchrome

cswapcolor.uc.js

// ==UserScript==
// @name           cswapcolor
// @namespace      http://d.hatena.ne.jp/serian/
// @description    change color of a part of Firefox depending on a selected id in cookieswap
// @include        main
// ==/UserScript==

(function(){
  var colors = {"○○○":"green", "■■■":"red"};
  var tabs = document.getElementById("nav-bar");
  var ostyle = tabs.getAttribute("style");
  function changeColor(){
    var color = "red";
    color = colors[document.getElementById("cookieswap-label").value];
    if(!color){
      tabs.setAttribute("style", ostyle);
    }else{
      tabs.setAttribute("style", "background-color: " + color + ";");
    }
  }

  var slabel = document.getElementById("cookieswap-label");
  slabel.addEventListener("DOMAttrModified", changeColor, false);
  changeColor();

})();