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/. */

 "use strict";

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 const Cu = Components.utils;

 const Cr = Components.results;

 Cu.import("resource://gre/modules/XPCOMUtils.jsm");

 Cu.import("resource://gre/modules/Services.jsm");

 addEventListener("DOMContentLoaded", function onLoad() {

   removeEventListener("DOMContentLoaded", onLoad);

   init_all();

 });

 function init_all() {

   document.documentElement.instantApply = true;

   gMainPane.init();

   gPrivacyPane.init();

   gAdvancedPane.init();

   gApplicationsPane.init();

   gContentPane.init();

   gSyncPane.init();

   gSecurityPane.init();

   var initFinished = document.createEvent("Event");

   initFinished.initEvent("Initialized", true, true);

   document.dispatchEvent(initFinished);

   let categories = document.getElementById("categories");

   categories.addEventListener("select", event => gotoPref(event.target.value));

   if (history.length > 1 && history.state) {

     selectCategory(history.state);

   } else {

     history.replaceState("paneGeneral", document.title);

   }

 }

 function selectCategory(name) {

   let categories = document.getElementById("categories");

   let item = categories.querySelector(".category[value=" + name + "]");

   categories.selectedItem = item;

 }

 function gotoPref(page) {

   window.history.replaceState(page, document.title);

   search(page, "data-category");

 }

 function search(aQuery, aAttribute) {

   let elements = document.getElementById("mainPrefPane").children;

   for (let element of elements) {

     let attributeValue = element.getAttribute(aAttribute);

     element.hidden = (attributeValue != aQuery);

   }

 }