Firefox 8 context menu

<!doctype html>
<html contextmenu="contextmenu">
<title>That's annoying</title>

<menu type="context" id="contextmenu">
    <menuitem label="I ruined right-click for you, is that OK?"></menuitem>
</menu>

<script>
    var item = document.getElementsByTagName("menuitem")[0],
        i = 10000;
    while (i--) {
        item_clone = item.cloneNode(false),
        document.getElementById('contextmenu').appendChild(item_clone);
    }
</script>