怎样在标签栏显示时间

如图这样，因为我是自动隐藏任务栏的，看时间就不是太方便。因此想要一个在标签栏显示时间的。
有一个uc脚本是这样显示时间的

function Clock() {
var D = new Date();
// var days = ["So","Mo", "Di", "Mi", "Do", "Fr", "Sa"];
//var day = days[D.getDay()];
var hours = D.getHours();
// var dateString = day + ", " + ("0"+D.getDate()).substr(-2) + "." + ("0"+(D.getMonth()+1)).substr(-2) + "." + D.getFullYear();
var timeString = ("0"+hours).substr(-2) + ":" + ("0"+D.getMinutes()).substr(-2);//+ " Uhr";
var statusC = document.getElementById("statusbar-clock-display");
// statusC.setAttribute("label", dateString + " - " + timeString);
statusC.setAttribute("label",timeString);
if (hours < 6 || hours > 22) {
statusC.setAttribute("style", "color: #ff0000;");
}
else {
statusC.setAttribute("style", "color: #00000;");
}
// Timeout variabel - damit Umschalten zur vollen Minute:
setTimeout("Clock()", (60- D.getSeconds())*1000);
}
if (location == "chrome://browser/content/browser.xul") {
// letztes Kindelement der Statusbar finden
// var ClockStatus = document.getElementById("status-bar").lastChild;
var ClockStatus = document.getElementById("nav-bar").firstChild;
//var ClockStatus = document.getElementById("addon-bar").lastChild;
var ClockPanel = document.createElement("statusbarpanel");
ClockPanel.setAttribute("id", "statusbar-clock-display");
// *vor* dem letzten Kindelement (s.o.) einfuegen - damit ist Uhr immer ganz rechts:
ClockStatus.parentNode.insertBefore(ClockPanel,ClockStatus.previousSibling);
Clock();
}
不知道可不可以改为在标签栏显示时间。