notificationbox_01.js

var notifyBox = window.getNotificationBox(content);
notifyBox.appendNotification( "XULit say: NotificationBox is cool, isn't it?",
			      "notify-01", 
                              "chrome://xulnotificationbox/content/xulit.ico", 
			      notifyBox.PRIORITY_INFO_LOW, null);

notificationbox_02.js

notifyBox.appendNotification( 
    "XULit say: NotificationBox is cool, isn't it?", 
    "notify-02", "chrome://xulnotificationbox/content/xulit.ico",   
    notifyBox.PRIORITY_WARNING_MEDIUM, [
        { accessKey: "O", label: "Ok", 
          callback: function(msg, btn) { alert("OK"); } },
        { accessKey: "K", label: "KO", popup: null, 
          callback: function(msg, btn) { alert("KO"); } },
    ]);

notificationbox_03.js

var msg = notifyBox.appendNotification(
              "XULit say: NotificationBox is cool, isn't it?", 
	      "notify-03", "chrome://xulnotificationbox/content/xulit.ico", 
	      notifyBox.PRIORITY_CRITICAL_BLOCK, null);

msg.addEventListener("DOMNodeRemoved", function(e) { alert("Closed"); }, false);