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diff --git a/dom/media/webaudio/test/test_AudioContext_disabled.html b/dom/media/webaudio/test/test_AudioContext_disabled.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test whether we can disable the AudioContext interface</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="webaudio.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+const webaudio_interfaces = [
+ "AudioContext",
+ "OfflineAudioContext",
+ "AudioContext",
+ "OfflineAudioCompletionEvent",
+ "AudioNode",
+ "AudioDestinationNode",
+ "AudioParam",
+ "GainNode",
+ "DelayNode",
+ "AudioBuffer",
+ "AudioBufferSourceNode",
+ "MediaElementAudioSourceNode",
+ "ScriptProcessorNode",
+ "AudioProcessingEvent",
+ "PannerNode",
+ "AudioListener",
+ "StereoPannerNode",
+ "ConvolverNode",
+ "AnalyserNode",
+ "ChannelSplitterNode",
+ "ChannelMergerNode",
+ "DynamicsCompressorNode",
+ "BiquadFilterNode",
+ "IIRFilterNode",
+ "WaveShaperNode",
+ "OscillatorNode",
+ "PeriodicWave",
+ "MediaStreamAudioSourceNode",
+ "MediaStreamAudioDestinationNode"
+];
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+ SpecialPowers.pushPrefEnv({"set": [["dom.webaudio.enabled", false]]}, function() {
+ webaudio_interfaces.forEach((e) => ok(!window[e], e + " must be disabled when the Web Audio API is disabled"));
+ SimpleTest.finish();
+ });
+});
+
+</script>
+</pre>
+</body>
+</html>