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diff --git a/dom/webidl/IIRFilterNode.webidl b/dom/webidl/IIRFilterNode.webidl
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index 000000000..a1164b6ae
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+++ b/dom/webidl/IIRFilterNode.webidl
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+/* -*- Mode: IDL; 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/.
+ *
+ * The origin of this IDL file is https://www.w3.org/TR/webaudio
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface IIRFilterNode : AudioNode {
+    void getFrequencyResponse(Float32Array frequencyHz, Float32Array magResponse, Float32Array phaseResponse);
+};
+
+// Mozilla extension
+IIRFilterNode implements AudioNodePassThrough;