--- a/browser/components/preferences/in-content/preferences.xul
+++ b/browser/components/preferences/in-content/preferences.xul
@@ -1,17 +1,15 @@
 <?xml version="1.0"?>
 <!-- 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/. -->
 
 <?xml-stylesheet href="chrome://global/skin/global.css"?>
 
-<?xml-stylesheet href="chrome://mozapps/content/preferences/preferences.css"?>
-
 <?xml-stylesheet href="chrome://browser/skin/preferences/preferences.css"?>
 <?xml-stylesheet href="chrome://global/skin/in-content/common.css"?>
 <?xml-stylesheet
   href="chrome://browser/skin/preferences/in-content/preferences.css"?>
 <?xml-stylesheet
   href="chrome://browser/content/preferences/handlers.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/applications.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/in-content/search.css"?>

--- a/browser/components/preferences/in-content/subdialogs.js
+++ b/browser/components/preferences/in-content/subdialogs.js
@@ -6,21 +6,22 @@
 
 var gSubDialog = {
   _closingCallback: null,
   _closingEvent: null,
   _isClosing: false,
   _frame: null,
   _overlay: null,
   _box: null,
-  _injectedStyleSheets: ["chrome://mozapps/content/preferences/preferences.css",
-                         "chrome://browser/skin/preferences/preferences.css",
-                         "chrome://global/skin/in-content/common.css",
-                         "chrome://browser/skin/preferences/in-content/preferences.css",
-                         "chrome://browser/skin/preferences/in-content/dialog.css"],
+  _injectedStyleSheets: [
+    "chrome://browser/skin/preferences/preferences.css",
+    "chrome://global/skin/in-content/common.css",
+    "chrome://browser/skin/preferences/in-content/preferences.css",
+    "chrome://browser/skin/preferences/in-content/dialog.css",
+  ],
   _resizeObserver: null,
 
   init: function() {
     this._frame = document.getElementById("dialogFrame");
     this._overlay = document.getElementById("dialogOverlay");
     this._box = document.getElementById("dialogBox");
     this._closeButton = document.getElementById("dialogClose");
   },