The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 var gProtocols = [];

 var gContainer;

 window.onload = function () {

   gContainer = document.getElementById("abouts");

   findAbouts();

 }

 function findAbouts() {

   var ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);

   for (var cid in Cc) {

     var result = cid.match(/@mozilla.org\/network\/protocol\/about;1\?what\=(.*)$/);

     if (result) {

       var aboutType = result[1];

       var contract = "@mozilla.org/network/protocol/about;1?what=" + aboutType;

       try {

         var am = Cc[contract].getService(Ci.nsIAboutModule);

         var uri = ios.newURI("about:"+aboutType, null, null);

         var flags = am.getURIFlags(uri);

         if (!(flags & Ci.nsIAboutModule.HIDE_FROM_ABOUTABOUT)) {

           gProtocols.push(aboutType);

         }

       } catch (e) {

         // getService might have thrown if the component doesn't actually

         // implement nsIAboutModule

       }

     }

   }

   gProtocols.sort().forEach(createProtocolListing);

 }

 function createProtocolListing(aProtocol) {

   var uri = "about:" + aProtocol;

   var li = document.createElement("li");

   var link = document.createElement("a");

   var text = document.createTextNode(uri);

   link.href = uri;

   link.appendChild(text);

   li.appendChild(link);

   gContainer.appendChild(li);

 }