x.js

/* This is a template command. */
CmdUtils.CreateCommand({
  names: ["what"],
  icon: "http://www.mozilla.com/favicon.ico",
  description: "A short description of your command.",
  help: "How to use your command.",
  author: {name: "Your Name", email: "you@mozilla.com"},
  license: "GPL",
  homepage: "http://labs.mozilla.com/",
  arguments: [{role: 'object', nountype: noun_arb_text}],
  preview: function preview(pblock, args) {
jQuery.getFeed({
   url: 'http://feeds.feedburner.com/tedtalks_video',
   success: function(feed) {
      var titel = feed.title;
   }
});
    pblock.innerHTML = titel;
  },
  execute: function execute(args) {
    displayMessage("You selected: " + args.object.text, this);
  }
});