gistfile1.txt

function popup(title, text) {
  try {
    Components.classes['@mozilla.org/alerts-service;1']
              .getService(Components.interfaces.nsIAlertsService)
              .showAlertNotification(null, title, text, false, '', null);
  } catch(e) {
    // prevents runtime error on platforms that don't implement nsIAlertsService
  }
}

for (i = 0; i <= 20; i++) {
 setTimeout(popup(i, "notification " + i, 10000))
}