file_bug557892.html

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<html><head>

<title>Crash [@ nsGenericElement::SetAttr] with classList.toggle</title>

<script>

var classList;

var interval;

function run() {

  classList = window.frames[0].document.documentElement.classList;

  window.frames[0].location.reload();

  interval = setInterval(function(aClassList) {aClassList.toggle('a'); forcegc();}, 10, classList);

  // Let the interval run for awhile and close the window after 2 seconds.

  setTimeout(function() { clearInterval(interval); window.opener.done(); window.close(); }, 2000);

function forcegc(){

  SpecialPowers.forceGC();

  SpecialPowers.gc();

    </script>

  </head>

  <body onload="run()">

    <iframe></iframe>

  </body>

</html>