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diff --git a/toolkit/components/finalizationwitness/nsIFinalizationWitnessService.idl b/toolkit/components/finalizationwitness/nsIFinalizationWitnessService.idl
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+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=40: */
+/* 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(15686f9d-483e-4361-98cd-37f1e8f1e61d)]
+interface nsIFinalizationWitnessService: nsISupports
+{
+ /**
+ * Create a new Finalization Witness.
+ *
+ * A finalization witness is an object whose sole role is to
+ * broadcast when it is garbage-collected. Once the witness is
+ * created, call method its method |forget()| to prevent the
+ * broadcast.
+ *
+ * @param aTopic The topic that the witness will broadcast using
+ * Services.obs.
+ * @param aString The string that the witness will broadcast.
+ * @return An object with a single method |forget()|.
+ */
+ [implicit_jscontext]
+ jsval make(in string aTopic, in wstring aString);
+};
+
+%{ C++
+
+#define FINALIZATIONWITNESSSERVICE_CID {0x15686f9d,0x483e,0x4361,{0x98,0xcd,0x37,0xf1,0xe8,0xf1,0xe6,0x1d}}
+#define FINALIZATIONWITNESSSERVICE_CONTRACTID "@mozilla.org/toolkit/finalizationwitness;1"
+
+%}