diff --git a/mozilla/network/public/nsIBlockingNotification.h b/mozilla/network/public/nsIBlockingNotification.h
new file mode 100644
index 00000000000..7f49e7c88c2
--- /dev/null
+++ b/mozilla/network/public/nsIBlockingNotification.h
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#ifndef nsIBlockingCallback_h___
+#define nsIBlockingCallback_h___
+
+#include "nscore.h"
+#include "nsISupports.h"
+#include "prthread.h"
+
+/* forward declarations... */
+class nsIURL;
+
+/* 7a3e0350-d724-11d2-99db-0080c7cb1080 */
+#define NS_IBLOCKINGNOTIFICATION_IID   \
+{ 0x7a3e0350, 0xd724, 0x11d2, \
+  {0x99, 0xdb, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80} }
+
+
+class nsIBlockingNotification : public nsISupports
+{
+public:
+  NS_IMETHOD IsBlocked(nsIURL *aUrl, PRBool *aResult) = 0;
+  NS_IMETHOD Resume(nsIURL *aUrl) = 0;
+};
+
+
+
+/* bd697440-d724-11d2-99db-0080c7cb1080 */
+#define NS_IBLOCKINGNOTIFICATION_OBSERVER_IID   \
+{ 0xbd697440, 0xd724, 0x11d2, \
+  {0x99, 0xdb, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80} }
+
+
+class nsIBlockingNotificationObserver : public nsISupports
+{
+public:
+  NS_IMETHOD Notify(nsIBlockingNotification *aCaller,
+                    nsIURL *aUrl,
+                    PRThread *aThread,
+                    PRInt32 aCode,
+                    nsISupports *aExtraInfo) = 0;
+
+  NS_IMETHOD CancelNotify(nsIURL *aUrl) = 0;
+};
+
+
+/* Generic status codes for nsIBlockingNotificationObserver::Notify(...) */
+#define NS_NOTIFY_SUCCEEDED     NS_OK
+#define NS_NOTIFY_BLOCKED       NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_NETWORK, 10)
+
+#endif /* nsIBlockingCallback_h___ */