求“状态栏显示标题”的ucjs，先谢谢了

var StatusTitle = {
    StuBar : null, AttrMod : null,

    Init : function() {
        AttrMod = 'DOMAttrModified';

        StuBar = document.getElementById('statusbar'
            +'-display');
        StuBar.addEventListener(AttrMod, StatusTitle.
            changeTitle, false);

        gBrowser.tabContainer.addEventListener('TabOpen',
            StatusTitle.onTabOpen, false);
        gBrowser.tabContainer.addEventListener('TabClose',
            StatusTitle.onTabClose, false);
        for(var n=0; n<gBrowser.mTabs.length; n++) {
            gBrowser.mTabs[n].addEventListener(AttrMod,
                StatusTitle.onTabOpen, false);
        }
    },

    onTabOpen : function(e) {
        e.target.addEventListener(AttrMod, StatusTitle.
            changeTitle, false);
    },

    onTabClose : function(e) {
        e.target.removeEventListener(AttrMod, StatusTitle
            .changeTitle, false);
    },

    changeTitle : function(e) {
        if (e.target.id == 'statusbar-display') {
            if (e.attrName=='label' && e.newValue==
                XULBrowserWindow.defaultStatus)
                StuBar.label = gBrowser.contentTitle;
        }
        else if(e.target==gBrowser.selectedTab && (e
            .attrName=='label' || (e.newValue=='true'
            && e.attrName=='selected'))) {
            setTimeout(function(e) {
                StuBar.label = gBrowser.contentTitle;
            }, 0);
        }    
    },
};

StatusTitle.Init();