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<!DOCTYPE HTML>
<html>
<body>
<pre id="test">
<script type="application/javascript">
/**
  Runs inside iframe in test_enumerateDevices.html.
*/

var pushPrefs = (...p) => SpecialPowers.pushPrefEnv({set: p});
var gUM = c => navigator.mediaDevices.getUserMedia(c);

(async () => {
  await pushPrefs(["media.navigator.streams.fake", true]);

  let devices = await navigator.mediaDevices.enumerateDevices();
  parent.postMessage(JSON.stringify(devices), "https://example.com:443");

})().catch(e => setTimeout(() => { throw e; }));
</script>
</pre>
</body>
</html>