<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>

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

function boom()
{
    var source = new window.MediaSource();
    var videoElement = document.createElementNS('http://www.w3.org/1999/xhtml', 'video');
    videoElement.src = URL.createObjectURL(source);

    setTimeout(function() {
        var buf = source.addSourceBuffer("video/webm");
        buf.abort();
        buf.appendBuffer(new Float32Array(203));
    }, 0);
}

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