diff --git a/content/media/webaudio/test/mochitest.ini b/content/media/webaudio/test/mochitest.ini
index 0a50ac96990..ae7e68dfb16 100644
--- a/content/media/webaudio/test/mochitest.ini
+++ b/content/media/webaudio/test/mochitest.ini
@@ -108,7 +108,6 @@ support-files =
 [test_pannerNode.html]
 [test_pannerNodeAbove.html]
 [test_pannerNodeChannelCount.html]
-[test_pannerNodeSymmetry.html]
 [test_pannerNodeTail.html]
 [test_pannerNode_equalPower.html]
 [test_periodicWave.html]
diff --git a/content/media/webaudio/test/test_pannerNodeSymmetry.html b/content/media/webaudio/test/test_pannerNodeSymmetry.html
deleted file mode 100644
index a4a2fc1c552..00000000000
--- a/content/media/webaudio/test/test_pannerNodeSymmetry.html
+++ /dev/null
@@ -1,104 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<head>
-  <title>Test left/right symmetry and block-offset invariance of HRTF panner</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">
-
-SimpleTest.waitForExplicitFinish();
-
-const blockSize = 128;
-const bufferSize = 4096;
-
-var ctx;
-var leftPannerOutput;
-var rightPannerOutput;
-
-function isChannelSilent(channel) {
-  for (var i = 0; i < channel.length; ++i) {
-    if (channel[i] != 0.0) {
-      return false;
-    }
-  }
-  return true;
-}
-
-function startTest() {
-  // Invert one signal so that mixing with the other will find the difference.
-  var gain = ctx.createGain();
-  gain.gain.value = -1.0;
-  leftPannerOutput.connect(gain);
-
-  var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
-  gain.connect(processor);
-  rightPannerOutput.connect(processor);
-  processor.onaudioprocess =
-    function(e) {
-      compareBuffers(e.inputBuffer,
-                     ctx.createBuffer(2, bufferSize, ctx.sampleRate));
-      e.target.onaudioprocess = null;
-      SimpleTest.finish();
-    }
-}
-
-function prepareTest() {
-  ctx = new AudioContext();
-  var leftPanner = ctx.createPanner();
-  var rightPanner = ctx.createPanner();
-  leftPanner.setPosition(-1,0,0);
-  rightPanner.setPosition(1,0,0);
-
-  // Test that PannerNode processes the signal consistently irrespective of
-  // the offset in the processing block.  This is done by inserting a delay of
-  // less than a block size before one panner.
-  const delayTime = 0.7 * blockSize / ctx.sampleRate;
-  var leftDelay = ctx.createDelay(delayTime);
-  leftDelay.delayTime.value = delayTime;
-  leftDelay.connect(leftPanner);
-  // and compensating for the delay after the other.
-  var rightDelay = ctx.createDelay(delayTime);
-  rightDelay.delayTime.value = delayTime;
-  rightPanner.connect(rightDelay);
-
-  // Feed the panners with a signal having some harmonics to fill the spectrum.
-  var oscillator = ctx.createOscillator();
-  oscillator.frequency.value = 110;
-  oscillator.type = "sawtooth";
-  oscillator.connect(leftDelay);
-  oscillator.connect(rightPanner);
-  oscillator.start(0);
-
-  // Switch the channels on one panner output, and it should match the other.
-  var splitter = ctx.createChannelSplitter();
-  leftPanner.connect(splitter);
-  var merger = ctx.createChannelMerger();
-  splitter.connect(merger, 0, 1);
-  splitter.connect(merger, 1, 0);
-
-  leftPannerOutput = merger;
-  rightPannerOutput = rightDelay;
-
-  // A PannerNode will produce no output until it has loaded its HRIR
-  // database.  Wait for this to load before starting the test.
-  var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
-  rightPanner.connect(processor);
-
-  processor.onaudioprocess =
-    function(e) {
-      if (isChannelSilent(e.inputBuffer.getChannelData(0)))
-        return;
-
-      e.target.onaudioprocess = null;
-      startTest();
-    };
-}
-prepareTest();
-</script>
-</pre>
-</body>
-</html>
