--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -6016,18 +6016,17 @@ function SetForcedDetector(doReload)
 
 function SetForcedCharset(charset)
 {
     BrowserSetForcedCharacterSet(charset);
 }
 
 function BrowserSetForcedCharacterSet(aCharset)
 {
-  var docCharset = gBrowser.docShell.QueryInterface(Ci.nsIDocCharset);
-  docCharset.charset = aCharset;
+  gBrowser.docShell.charset = aCharset;
   // Save the forced character-set
   PlacesUtils.history.setCharsetForURI(getWebNavigation().currentURI, aCharset);
   BrowserReloadWithFlags(nsIWebNavigation.LOAD_FLAGS_CHARSET_CHANGE);
 }
 
 function BrowserSetForcedDetector(doReload)
 {
   gBrowser.documentCharsetInfo.forcedDetector = true;

--- a/docshell/base/Makefile.in
+++ b/docshell/base/Makefile.in
@@ -64,16 +64,17 @@ XPIDLSRCS = \
   nsIDocShellTreeItem.idl \
   nsIDocShellTreeNode.idl \
   nsIDocShellTreeOwner.idl \
   nsIDocShellHistory.idl \
   nsIGlobalHistory2.idl \
   nsIMarkupDocumentViewer.idl \
   nsIScrollable.idl \
   nsITextScroll.idl \
+  nsIDocCharset.idl \
   nsIWebNavigation.idl \
   nsIWebNavigationInfo.idl \
   nsIContentViewer.idl \
   nsIContentViewerEdit.idl \
   nsIContentViewerFile.idl \
   nsIURIFixup.idl \
   nsIEditorDocShell.idl \
   nsIWebPageDescriptor.idl \

new file mode 100644
--- /dev/null
+++ b/docshell/base/nsIDocCharset.idl
@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+/**
+ * The functionality of the nsIDocCharset interface has been incorporated into
+ * nsIDocShell.
+ *
+ * This is an empty interface for backwards compatibility that will go away at
+ * some point in the future
+ *
+ */
+
+[scriptable, uuid(c3faaf6e-40f0-11e1-95fc-6c626d69675c)]
+interface nsIDocCharset : nsISupports
+{};

--- a/docshell/base/nsIDocShell.idl
+++ b/docshell/base/nsIDocShell.idl
@@ -67,17 +67,17 @@ interface nsIRequest;
 interface nsISHEntry;
 interface nsILayoutHistoryState;
 interface nsISecureBrowserUI;
 interface nsIDOMStorage;
 interface nsIPrincipal;
 interface nsIWebBrowserPrint;
 interface nsIVariant;
 
-[scriptable, uuid(0666adf8-8738-4ca7-a917-0348f47d2f40)]
+[scriptable, uuid(0615d1a6-313f-11e1-a043-6c626d69675c)]
 interface nsIDocShell : nsISupports
 {
   /**
    * Loads a given URI.  This will give priority to loading the requested URI
    * in the object implementing	this interface.  If it can't be loaded here
    * however, the URL dispatcher will go through its normal process of content
    * loading.
    *
@@ -548,9 +548,45 @@ interface nsIDocShell : nsISupports
    */
   attribute boolean isAppTab;
 
   /**
    * Create a new about:blank document and content viewer.
    * @param aPrincipal the principal to use for the new document.
    */
   void createAboutBlankContentViewer(in nsIPrincipal aPrincipal);
+
+  /**
+   * The charset attribute allows the user to view, hint, and set which
+   * converter is used to read the document's data.
+   *
+   * <P>Inside Mozilla all text is encoded as Unicode. By standardizing  
+   * on Unicode every piece of code that handles characters no longer 
+   * needs to: 
+   *
+   *     Have access to a character encoding parameter.
+   *     Ask is the data stateful?
+   *     Ask is the data single byte?
+   *     Ask is the data multi-byte?
+   *     If multi-byte: have access to a routine that can
+   *         determine how many bytes in the current character.
+   *
+   * When the document is read in a converter is used to convert 
+   * the document's data to Unicode.
+   *
+   * The charset attribute provides the ability to:
+   *
+   *   See what converter was used when inputting the documents
+   *   data.
+   *
+   *   Override the character set for documents where the specified 
+   *   fallback, or auto-detected character set is incorrect
+   *
+   * Get/sets the encoding (converter) used to read the 
+   * document. Get returns the encoding used. Set forces 
+   * (overrides) the encoding. After forcing the charset the 
+   * embedding application will need to cause the data to be 
+   * reparsed in order to update the DOM / display.
+   *
+   * A force also sets the fallback encoding for this frame.
+   */
+  attribute string charset;
 };

--- a/docshell/test/Makefile.in
+++ b/docshell/test/Makefile.in
@@ -120,16 +120,17 @@ include $(topsrcdir)/config/rules.mk
 		file_bug669671.sjs \
 		test_bug675587.html \
 		test_bfcache_plus_hash.html \
 		test_bug680257.html \
 		file_bug680257.html \
 		test_bug691547.html \
 		bug691547_frame.html \
 		test_bug694612.html \
+		test_bug713825.html \
 		$(NULL)
 
 ifeq ($(MOZ_WIDGET_TOOLKIT),cocoa)
 _TEST_FILES += \
 		test_bug511449.html \
 		file_bug511449.html \
 		$(NULL)
 endif

new file mode 100644
--- /dev/null
+++ b/docshell/test/test_bug713825.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=713825
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 713825</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=713825">Mozilla Bug 713825</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** 
+ * Test for Bug 713825 
+ *  test that nsIDocCharset still works backward compatibly
+ */
+netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
+var Ci = Components.interfaces;
+var docShell = window.QueryInterface(Ci.nsIInterfaceRequestor).
+                      getInterface(Ci.nsIWebNavigation).
+                      QueryInterface(Ci.nsIDocShell);
+
+var charset1 = docShell.charset;
+var charset2 = docShell.QueryInterface(Ci.nsIDocCharset).charset;
+var charset3 = window.QueryInterface(Ci.nsIInterfaceRequestor).
+                      getInterface(Ci.nsIDocCharset).charset;
+
+/* if we get here without throwing and the three charsets are equal, all is OK */
+is(charset1, charset2, "QI'd nsIDocCharset.charset should equal nsIDocShell.charset");
+is(charset1, charset3, "getInterface'd nsIDocCharset.charset should equal nsIDocShell.charset");
+
+</script>
+</pre>
+</body>
+</html>

--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -8313,16 +8313,17 @@ nsGlobalWindow::GetInterface(const nsIID
   *aSink = nsnull;
 
   if (aIID.Equals(NS_GET_IID(nsIDocCharset))) {
     FORWARD_TO_OUTER(GetInterface, (aIID, aSink), NS_ERROR_NOT_INITIALIZED);
 
     if (mDocShell) {
       nsCOMPtr<nsIDocCharset> docCharset(do_QueryInterface(mDocShell));
       if (docCharset) {
+        NS_WARNING("Using deprecated nsIDocCharset: use nsIDocShell.GetCharset() instead ");
         *aSink = docCharset;
         NS_ADDREF(((nsISupports *) *aSink));
       }
     }
   }
   else if (aIID.Equals(NS_GET_IID(nsIWebNavigation))) {
     FORWARD_TO_OUTER(GetInterface, (aIID, aSink), NS_ERROR_NOT_INITIALIZED);
 

--- a/intl/chardet/public/Makefile.in
+++ b/intl/chardet/public/Makefile.in
@@ -41,17 +41,16 @@ srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= chardet
 
 XPIDLSRCS       = \
                 nsIDocumentCharsetInfo.idl \
-                nsIDocCharset.idl \
 		$(NULL)
 
 EXPORTS		= \
 		nsDetectionConfident.h \
 		nsDocumentCharsetInfoCID.h \
 		nsICharsetDetectionObserver.h \
 		nsICharsetDetector.h \
 		nsIStringCharsetDetector.h \

deleted file mode 100644
--- a/intl/chardet/public/nsIDocCharset.idl
+++ /dev/null
@@ -1,86 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2001
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *   Brian Stell <bstell@netscape.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#include "nsISupports.idl"
-
-/**
- * The nsIDocCharset interface allows the user to view, 
- * hint, and set which converter is used to read the document's 
- * data.
- *
- * <P>Inside Mozilla all text is encoded as Unicode. By standardizing  
- * on Unicode every piece of code that handles characters no longer 
- * needs to: 
- *
- *     Have access to a character encoding parameter.
- *     Ask is the data stateful?
- *     Ask is the data single byte?
- *     Ask is the data multi-byte?
- *     If multi-byte: have access to a routine that can
- *         determine how many bytes in the current character.
- *
- * When the document is read in a converter is used to convert 
- * the document's data to Unicode.
- *
- * nsIDocCharset provides the ability to:
- *
- *   See what converter was used when inputting the documents
- *   data.
- *
- *   Override the character set for documents where the specified 
- *   fallback, or auto-detected character set is incorrect
- *
- */
-[scriptable, uuid(9c18bb4e-1dd1-11b2-bf91-9cc82c275823)]
-interface nsIDocCharset : nsISupports
-{
-    
-    /**
-     * Get/sets the encoding (converter) used to read the 
-     * document. Get returns the encoding used. Set forces 
-     * (overrides) the encoding. After forcing the charset the 
-     * embedding application will need to cause the data to be 
-     * reparsed in order to update the DOM / display.
-     *
-     * A force also sets the fallback encoding for this frame.
-     */
-    attribute string charset;
-
-};
-
-

--- a/mobile/xul/chrome/content/content.js
+++ b/mobile/xul/chrome/content/content.js
@@ -590,18 +590,17 @@ let Content = {
         let manifestURI = Services.io.newURI(json.manifest, json.charset, currentURI);
         let updateService = Cc["@mozilla.org/offlinecacheupdate-service;1"]
                             .getService(Ci.nsIOfflineCacheUpdateService);
         updateService.scheduleUpdate(manifestURI, currentURI, content);
         break;
       }
 
       case "Browser:SetCharset": {
-        let docCharset = docShell.QueryInterface(Ci.nsIDocCharset);
-        docCharset.charset = json.charset;
+        docShell.charset = json.charset;
 
         let webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
         webNav.reload(Ci.nsIWebNavigation.LOAD_FLAGS_CHARSET_CHANGE);
         break;
       }
 
       case "Browser:CanCaptureMouse": {
         sendAsyncMessage("Browser:CanCaptureMouse:Return", {

--- a/toolkit/components/viewsource/content/viewSource.js
+++ b/toolkit/components/viewsource/content/viewSource.js
@@ -159,18 +159,17 @@ function viewSource(url)
       }
     }
     // If the document had a forced charset, set it here also
     if (window.arguments.length >= 5) {
       arg = window.arguments[4];
 
       try {
         if (arg === true) {
-          var docCharset = gBrowser.docShell.QueryInterface(Ci.nsIDocCharset);
-          docCharset.charset = charset;
+          gBrowser.docShell.charset = charset;
         }
       } catch (ex) {
         // Ignore the failure and keep processing arguments...
       }
     }
 
     // Get any specified line to jump to.
     if (window.arguments.length >= 4) {
@@ -711,18 +710,17 @@ function highlightSyntax()
 
   gPageLoader.loadPage(gPageLoader.currentDescriptor, gPageLoader.DISPLAY_NORMAL);
 }
 
 // Fix for bug 136322: this function overrides the function in
 // browser.js to call PageLoader.loadPage() instead of BrowserReloadWithFlags()
 function BrowserSetForcedCharacterSet(aCharset)
 {
-  var docCharset = gBrowser.docShell.QueryInterface(Ci.nsIDocCharset);
-  docCharset.charset = aCharset;
+  gBrowser.docShell.charset = aCharset;
   if (isHistoryEnabled()) {
     gPageLoader.loadPage(gPageLoader.currentDescriptor,
                          gPageLoader.DISPLAY_NORMAL);
   } else {
     gBrowser.reloadWithFlags(Ci.nsIWebNavigation.LOAD_FLAGS_CHARSET_CHANGE);
   }
 }
 

--- a/uriloader/prefetch/nsPrefetchService.cpp
+++ b/uriloader/prefetch/nsPrefetchService.cpp
@@ -36,17 +36,16 @@
  * ***** END LICENSE BLOCK ***** */
 
 #include "nsPrefetchService.h"
 #include "nsICacheSession.h"
 #include "nsICacheService.h"
 #include "nsIServiceManager.h"
 #include "nsICategoryManager.h"
 #include "nsIObserverService.h"
-#include "nsIDocCharset.h"
 #include "nsIWebProgress.h"
 #include "nsCURILoader.h"
 #include "nsICachingChannel.h"
 #include "nsICacheVisitor.h"
 #include "nsIHttpChannel.h"
 #include "nsIURL.h"
 #include "nsISimpleEnumerator.h"
 #include "nsNetUtil.h"