<!DOCTYPE html>
<html>
<head>
<script>

/*
user_pref("media.mediasource.enabled", true);
*/

function boom()
{
    var mediaSource = new MediaSource();
    var htmlAudio = document.createElement("audio");
    htmlAudio.src = URL.createObjectURL(mediaSource);

    setTimeout(function() {
        var sourceBuffer = mediaSource.addSourceBuffer("video/webm");
        mediaSource.removeSourceBuffer(sourceBuffer);
        sourceBuffer.remove(0, 0);
    }, 0);
}

</script>
</head>
<body onload="boom();"></body>
</html>
