Uhr in Tunderbird

function doDatUhrCallback() {try{doDatUhr();}catch(ex){} }
function doDatUhr() {
    var days = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"];
    var months = ["Jan", "Feb", "März", "Apr", "Mai", "Juni", "Juli", "Aug", "Sep", "Okt", "Nov", "Dez"];

    window.setTimeout(doDatUhrCallback, 1000);

    var D = new Date();
    var day = days[D.getDay()];
    var month = months[D.getMonth()];
    var year = D.getFullYear();
    var hour = D.getHours();
    var minute = D.getMinutes();
    var second = D.getSeconds();

    var date = " " + day + ", " + (D.getDate() < 10 ? "0" +D.getDate() : D.getDate()) + ". " + month + " " + year + "  \u2013  ";
    var time = (hour < 10 ? "0" +hour : hour) + ":" + (minute < 10 ? "0" +minute : minute) + ":" + (second < 10 ? "0" +second : second);
    var timestr = date + time + "" + "    ";
    var FFstr = AppConstants.MOZ_MACBUNDLE_NAME.split('.');
    var mbName = FFstr[0];
    var text = mbName + ' ' + AppConstants.MOZ_APP_VERSION_DISPLAY + '       ' + "> gestaltet von EDV Oldie <       "; 

    var status = document.getElementById("statusbar-clock-display");
    status.setAttribute("value",text + timestr);}

    //var ClockStatus = document.getElementById("statusbar-display");
    var ClockStatus = document.getElementById("helpMenu");
    var ClockLabel = document.createElement("label");
    ClockLabel.setAttribute("id", "statusbar-clock-display");
    ClockLabel.setAttribute("class", "statusbarpanel-text");
    ClockLabel.setAttribute("style", "padding-top:0px; padding-left:10px;color:blue");
    ClockStatus.parentNode.insertBefore(ClockLabel, ClockStatus.nextSibling);
    doDatUhr();

(function() {
    function doDatClock() {
        var timestr = new Date().toLocaleDateString( locale , options );
        
        const blanks = '     ';
        let i = timestr.lastIndexOf(',');
        timestr = timestr.substring(0,i) + blanks + timestr.substring(i+1);
        
        if( count == 1 ) {
            var counter = new Date( 1000 * sec ).toISOString().substr( 11 , 8 ); // .replace(/^[0:]+/, '') // if you want to replace zeroes and colons
            timestr = timestr + '       (' + counter + ')';
            sec++;
        }
        ClockLabel.setAttribute( 'value', timestr );
    }

    var count = 1; // if you don't want a counter set this to zero
    var agent = 1; // if you just want the clock set this to zero
    var language = 'de-DE'; // locale, e.g. 'de-DE' , 'en-US' , 'fr-FR'
    var personalText = ''; // your personal text here
    var cssColor = 'black'; // Font Color

    var css = 'margin-left: 30px; padding-top: 4px !important; padding-left: 0px; color: ' + cssColor + '; font-weight: 600; text-shadow: none; width: 275px;';
    var cssA = 'margin-left: 70px; width: auto;';

    var options = {
        weekday: 'long',
        year: 'numeric',
        month: 'long',
        day: 'numeric',
                   hour: '2-digit',
        minute: '2-digit',
        second: '2-digit'
    };

    var sec = 0;

    var locale = language || window.navigator.languages[0];

    var position = document.getElementById('helpMenu');

    var ClockLabel = document.createElement('label');
    ClockLabel.setAttribute('id', 'statusbar-clock-display');
    ClockLabel.setAttribute('class', 'statusbarpanel-text');
    ClockLabel.setAttribute('style', css);
    position.parentNode.insertBefore(ClockLabel, position.nextSibling);

    if( agent == 1 ) {
        var AgentLabel = document.createElement('label');
        AgentLabel.setAttribute('id', 'statusbar-agent-display');
        AgentLabel.setAttribute('class', 'statusbarpanel-text');
        AgentLabel.setAttribute('style', css + cssA);
        var FFstr = window.navigator.userAgent.split(' ');
        var FF = FFstr[FFstr.length-1].replace( '/' , ' ' );
        var text  = " Firefox - G  Profile  " + AppConstants.MOZ_APP_VERSION_DISPLAY;
        AgentLabel.setAttribute( 'value', text );
        position.parentNode.insertBefore(AgentLabel, position.nextSibling);
    }

    if( count == 1 ) {
        ClockLabel.addEventListener('dblclick', function() { sec = 0; });
    }

    window.setInterval( doDatClock , 1000 );
})();