diff -r 000000000000 -r 6474c204b198 content/base/public/nsIDOMFormData.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/public/nsIDOMFormData.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsIVariant;
+
+[scriptable, uuid(256c9139-5a29-41e1-8698-f9f9aae7d6cf)]
+interface nsIDOMFormData : nsISupports 
+{
+  void append(in DOMString name, in nsIVariant value);
+};
+
+%{ C++
+#define NS_FORMDATA_CID \
+{ 0x6b192618, 0x26f2, 0x426e, \
+  { 0xa7, 0xac, 0x1e, 0x13, 0xa6, 0xa4, 0x52, 0x2b } }
+
+#define NS_FORMDATA_CONTRACTID "@mozilla.org/files/formdata;1"
+%}