add: if (!/Mac/.test(navigator.platform)) document.getElementById('newMailNotificationBounce').setAttribute("hidden", true); 
context: function Startup(){  PlaySoundCheck();  // if we don't have the alert service, hide the pref UI for using alerts to notify on new mail  // see bug #158711  var newMailNotificationAlertUI = document.getElementById("newMailNotificationAlert");  newMailNotificationAlertUI.hidden = !("@mozilla.org/alerts-service;1" in Components.classes);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/9df6dfcb524d92b8f0cfa3954fc826075b7862df/pref-notifications.js/clean/mailnews/base/prefs/resources/content/pref-notifications.js