var UserLine = {
    styleService: function(unregister) {
        var style1 = Components.classes['@mozilla.org/content/style-sheet-service;1'].getService(Components.interfaces.nsIStyleSheetService);
        var style2 = Components.classes['@mozilla.org/network/io-service;1'].getService(Components.interfaces.nsIIOService);
        var style3;
        var cssUserLine = "@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul); #navigator-toolbox::after {display:none !important;background: green;}"
        style3 = style2.newURI("data:text/css,"+encodeURIComponent(cssUserLine), null, null);
        if (unregister === true) {
            if (style1.sheetRegistered(style3, style1.USER_SHEET)) {style1.unregisterSheet(style3, style1.USER_SHEET);}
        } else {
            if (!style1.sheetRegistered(style3, style1.USER_SHEET)) {style1.loadAndRegisterSheet(style3, style1.USER_SHEET);}
        }
    },

    register: function() {
        var tabContainer = gBrowser.tabContainer;
        var newtab = Components.classes["@mozilla.org/preferences-service;1"]
                                       .getService(Components.interfaces.nsIPrefService)
                                       .getBranch("browser.");


        function newTab() {
                var tabUrl = window.getBrowser().selectedBrowser.contentWindow.location.href;
                if(tabUrl == 'about:newtab' || tabUrl == 'about:blank' || tabUrl == 'chrome://fastdial/content/fastdial.html') {
                    UserLine.styleService(false)
                } else {
                    UserLine.styleService(true)
                }
        }

            tabContainer.removeEventListener("TabSelect", newTab, false);
            tabContainer.addEventListener("TabSelect", newTab, false);
            tabContainer.removeEventListener("TabAttrModified", newTab, false);
            tabContainer.addEventListener("TabAttrModified", newTab, false);

    },
};

window.addEventListener("load", function load(){
    window.removeEventListener("load", load, false);
    UserLine.register();
},false);
window.addEventListener("load", function(event){UserLine.register();}, false);