<menupopup xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="d" popup="d">
<script>
function doe() {
var d = document.getElementById('d');
if (d.openPopup) {
  d.openPopup(document.documentElement, 'before_start', 0, 0, false, false);
//  alert(d.state);
}
  
if (d.showPopup)
  d.showPopup();
}
setTimeout(doe, 200);
</script>
</menupopup>