alert_close.js

// This is a convenience method that exists to determine if the window should be closed or not.
// There could be a lot more logic here, but for now we are just closing any window whose
// location property is equal to "chrome://global/content/commonDialog.xul", which is what the
// alert boxes that I have tested use.
alertClose: function (subject) {
  if(subject.location == "chrome://global/content/commonDialog.xul") {
    window.setTimeout(function() { subject.close(); }, 1000);
  }
}