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<!doctype html>
    <head>
        <title>AJAX-Requests vs. Firefox v11</title>
        <style type="text/css">
            #test {width:800px; margin-left:auto; margin-right:auto;}
            h1 {text-align:center;}
            p {font-size:20px; padding:10px 100px 10px 100px;}
            p.left {text-align:left;}
            p.right {text-align:right;}
        </style>
    </head>
    <body>
        <div id="test">
            <h1>Loading this page with FF11 the second ajax response won´t arrive.</h1>
        </div>
        <script type="text/javascript">
            var xmlHttp;

            try { xmlHttp = new XMLHttpRequest(); } //Firefox, Opera 8.0+, Safari
            catch(e) { //Internet Explorer
                try { xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); }
                catch(e) {
                    try { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); }
                    catch(e) {
                        alert("Your browser does not support AJAX! " + e.getMessage())
                        xmlHttp = false;
                    }
                }
            }
            xmlHttp.open('POST', 'test.html', true);
            xmlHttp.onreadystatechange = function () {
                if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
                    document.getElementById("test").innerHTML += "<p class='right'>The first response arrives</p>";
                    xmlHttp.open('POST', 'test.html', true);
                    xmlHttp.onreadystatechange = function () {
                        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
                            document.getElementById("test").innerHTML += "<p class='right'>...but the second response is for non-FF11 Users only</p>";
                        }};
                    document.getElementById("test").innerHTML += "<p class='left'>The second request is sent...</p>";
                    xmlHttp.send();
                }};
            document.getElementById("test").innerHTML += "<p class='left'>The first request is sent</p>";
            xmlHttp.send();
        </script>
    </body>
</html>