Issue 2374 - Implemented Tweaks section in options page

options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 691 matching lines @@
     {
       return checkbox.getAttribute("data-pref");
     });
     tweaks.forEach(function(key)
     {
       getPref(key, function(value)
       {
         onPrefMessage(key, value);
       });
     });
+    ext.backgroundPage.sendMessage(
+    {
+      type: "app.get",
+      what: "features"
+    },
+    function(features)
+    {
+      hidePref("show_devtools_panel", !features.devToolsPanel);
+      hidePref("safari_contentblocker", !features.safariContentBlocker);
+    });
 
     var filterTextbox = document.querySelector("#custom-filters-add input");
     placeholderValue = getMessage("options_customFilters_textbox_placeholder");
     filterTextbox.setAttribute("placeholder", placeholderValue);
     function addCustomFilters()
     {
       var filterText = filterTextbox.value;
       sendMessageHandleErrors(
       {
         type: "filters.add",
@@ skipping 278 matching lines @@
   getPref.checkNone = function(callback)
   {
     callback(true);
   };
 
   getPref.checks =
   {
     notifications_ignoredcategories: function(callback)
     {
       getPref("notifications_showui", callback);
-    },
-    safari_contentblocker: function(callback)
-    {
-      ext.backgroundPage.sendMessage(
-      {
-        type: "app.get",
-        what: "features"
-      },
-      function(features)
-      {
-        callback(features.safariContentBlocker);
-      });
     }
   };
 
   function onPrefMessage(key, value)
   {
     var checkbox = document.querySelector("[data-pref='" + key + "'] button[role='checkbox']");
     if (checkbox)
     {
       if (key == "notifications_ignoredcategories")
         value = (value.indexOf("*") == -1);
@@ skipping 77 matching lines @@
   });
   ext.backgroundPage.sendMessage(
   {
     type: "filters.listen",
     filter: ["added", "loaded", "removed"]
   });
   ext.backgroundPage.sendMessage(
   {
     type: "prefs.listen",
     filter: ["notifications_ignoredcategories", "notifications_showui",
-        "safari_contentblocker", "shouldShowBlockElementMenu"]
+        "safari_contentblocker", "show_devtools_panel",
+        "shouldShowBlockElementMenu"]
   });
   ext.backgroundPage.sendMessage(
   {
     type: "subscriptions.listen",
-    filter: ["added", "disabled", "homepage", "lastDownload", "removed", "title"]
+    filter: ["added", "disabled", "homepage", "lastDownload", "removed",
+        "title"]
   });
 
   window.addEventListener("DOMContentLoaded", onDOMLoaded, false);
 })();