diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 8ecacd4b51d6..f9339b17dd03 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -149,7 +149,6 @@
 
 #include "nsCommandManager.h"
 #include "nsPIDOMWindow.h"
-#include "nsPILoadGroupInternal.h"
 #include "nsPIWindowRoot.h"
 
 #include "IHistory.h"
@@ -6693,11 +6692,6 @@ nsresult nsDocShell::EndPageLoad(nsIWebProgress* aProgress,
     if (NS_SUCCEEDED(rv) && !channelCreationTime.IsNull()) {
       Telemetry::AccumulateTimeDelta(Telemetry::TOTAL_CONTENT_PAGE_LOAD_TIME,
                                      channelCreationTime);
-      nsCOMPtr<nsPILoadGroupInternal> internalLoadGroup =
-          do_QueryInterface(mLoadGroup);
-      if (internalLoadGroup) {
-        internalLoadGroup->OnEndPageLoad(aChannel);
-      }
     }
   }
 
diff --git a/netwerk/base/moz.build b/netwerk/base/moz.build
index d197ff34f728..07408d4b1db0 100644
--- a/netwerk/base/moz.build
+++ b/netwerk/base/moz.build
@@ -127,7 +127,6 @@ XPIDL_SOURCES += [
     'nsIURIWithSpecialOrigin.idl',
     'nsIURL.idl',
     'nsIURLParser.idl',
-    'nsPILoadGroupInternal.idl',
     'nsPISocketTransportService.idl',
 ]
 
diff --git a/netwerk/base/nsLoadGroup.cpp b/netwerk/base/nsLoadGroup.cpp
index f66e04ef198d..f44a67f49909 100644
--- a/netwerk/base/nsLoadGroup.cpp
+++ b/netwerk/base/nsLoadGroup.cpp
@@ -117,7 +117,6 @@ nsLoadGroup::~nsLoadGroup() {
 NS_IMPL_AGGREGATED(nsLoadGroup)
 NS_INTERFACE_MAP_BEGIN_AGGREGATED(nsLoadGroup)
   NS_INTERFACE_MAP_ENTRY(nsILoadGroup)
-  NS_INTERFACE_MAP_ENTRY(nsPILoadGroupInternal)
   NS_INTERFACE_MAP_ENTRY(nsILoadGroupChild)
   NS_INTERFACE_MAP_ENTRY(nsIRequest)
   NS_INTERFACE_MAP_ENTRY(nsISupportsPriority)
@@ -692,18 +691,6 @@ nsLoadGroup::GetRootLoadGroup(nsILoadGroup **aRootLoadGroup) {
   return NS_OK;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-// nsPILoadGroupInternal methods:
-
-NS_IMETHODIMP
-nsLoadGroup::OnEndPageLoad(nsIChannel *aDefaultChannel) {
-  LOG(("nsLoadGroup::OnEndPageLoad this=%p default-request=%p", this,
-       aDefaultChannel));
-
-  // for the moment, nothing to do here.
-  return NS_OK;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // nsISupportsPriority methods:
 
diff --git a/netwerk/base/nsLoadGroup.h b/netwerk/base/nsLoadGroup.h
index 14107bc32dad..79015447d5f8 100644
--- a/netwerk/base/nsLoadGroup.h
+++ b/netwerk/base/nsLoadGroup.h
@@ -8,7 +8,6 @@
 
 #include "nsILoadGroup.h"
 #include "nsILoadGroupChild.h"
-#include "nsPILoadGroupInternal.h"
 #include "nsAgg.h"
 #include "nsCOMPtr.h"
 #include "nsWeakReference.h"
@@ -26,8 +25,7 @@ namespace net {
 class nsLoadGroup : public nsILoadGroup,
                     public nsILoadGroupChild,
                     public nsISupportsPriority,
-                    public nsSupportsWeakReference,
-                    public nsPILoadGroupInternal {
+                    public nsSupportsWeakReference {
  public:
   NS_DECL_AGGREGATED
 
@@ -38,7 +36,6 @@ class nsLoadGroup : public nsILoadGroup,
   ////////////////////////////////////////////////////////////////////////////
   // nsILoadGroup methods:
   NS_DECL_NSILOADGROUP
-  NS_DECL_NSPILOADGROUPINTERNAL
 
   ////////////////////////////////////////////////////////////////////////////
   // nsILoadGroupChild methods:
diff --git a/netwerk/base/nsPILoadGroupInternal.idl b/netwerk/base/nsPILoadGroupInternal.idl
deleted file mode 100644
index 6b12304a4f60..000000000000
--- a/netwerk/base/nsPILoadGroupInternal.idl
+++ /dev/null
@@ -1,28 +0,0 @@
-/* -*- 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"
-
-interface nsIChannel;
-
-/**
- * Dumping ground for load group experimental work.
- * This interface will never be frozen.  If you are
- * using any feature exposed by this interface, be aware that this interface
- * will change and you will be broken.  You have been warned.
- */
-[scriptable, uuid(6ef2f8ac-9584-48f3-957a-0c94fff0c8c7)]
-interface nsPILoadGroupInternal : nsISupports
-{
-
-    /**
-     * Called when the load group has loaded main page and
-     * subresources. (i.e.essentially DOMComplete)
-     *
-     * @param aDefaultChanel
-     *        The request channel for the base apge
-     */
-    void OnEndPageLoad(in nsIChannel aDefaultChannel);
-};