diff -r 000000000000 -r 6474c204b198 netwerk/base/public/nsIByteRangeRequest.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/base/public/nsIByteRangeRequest.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 2; 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"
+
+[scriptable, uuid(C1B1F426-7E83-4759-9F88-0E1B17F49366)]
+interface nsIByteRangeRequest : nsISupports
+{
+    /** 
+     * Returns true IFF this request is a byte range request, otherwise it
+     * returns false (This is effectively the same as checking to see if 
+     * |startRequest| is zero and |endRange| is the content length.)
+     */
+    readonly attribute boolean isByteRangeRequest;
+
+    /** 
+     * Absolute start position in remote file for this request.
+     */
+    readonly attribute long long startRange;
+
+    /**
+     * Absolute end postion in remote file for this request
+     */
+    readonly attribute long long endRange;
+};