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diff --git a/dom/webidl/BiquadFilterNode.webidl b/dom/webidl/BiquadFilterNode.webidl
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+++ b/dom/webidl/BiquadFilterNode.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://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum BiquadFilterType {
+  "lowpass",
+  "highpass",
+  "bandpass",
+  "lowshelf",
+  "highshelf",
+  "peaking",
+  "notch",
+  "allpass"
+};
+
+dictionary BiquadFilterOptions : AudioNodeOptions {
+             BiquadFilterType type = "lowpass";
+             float            Q = 1;
+             float            detune = 0;
+             float            frequency = 350;
+             float            gain = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface BiquadFilterNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional BiquadFilterOptions options = {});
+
+    attribute BiquadFilterType type;
+    readonly attribute AudioParam frequency; // in Hertz
+    readonly attribute AudioParam detune; // in Cents
+    readonly attribute AudioParam Q; // Quality factor
+    readonly attribute AudioParam gain; // in Decibels
+
+    [Throws]
+    undefined getFrequencyResponse(Float32Array frequencyHz,
+                                   Float32Array magResponse,
+                                   Float32Array phaseResponse);
+
+};
+
+// Mozilla extension
+BiquadFilterNode includes  AudioNodePassThrough;