Killing popup dialogs in Firefox

Killing popup dialogs in Firefox

// 1) Install Firebug
// 2) In a new browser window, open this URL:
//     chrome://global/content/commonDialog.xul
//     (It doesn't matter the particular .xul file you open, as long as it is a valid XUL file.)
// 3) Launch JavaScript Shell in Firebug
// 4) In the new shell window, type the following commands:

var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"] 
                   .getService(Components.interfaces.nsIWindowMediator); 

var enumerator = wm.getEnumerator(null); 

// Get a handle to the current window
var win = enumerator.getNext(); 

// View the "Before" alert.
win.alert("Hello");

var ww = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                   .getService(Components.interfaces.nsIWindowWatcher);
                   
var watcher = {
  observe: function(subject, topic, data) {
    if (topic == "domwindowopened") {
      // unfortunately you can't get anything useful from subject here.
      // You need to wait for it to load. The best way to do 
      // that is to hook it's load event:
      subject.addEventListener("load", function() { _firebug.log("hello, there was a load event"); }, false);

      // as a proof of concept, I did:
      window.setTimeout(function() { _firebug.log(subject.location.href) }, 0);
    }
  }
};

ww.registerNotification(watcher); 

// Now we can "watch" for the alert when it happens...
win.alert("Hello!")

// Don't forget to unregister the watcher before you modify it!
ww.unregisterNotification(watcher) 

// Now there shouldn't be a watcher watching...
win.alert("Hello!")


// Let's modify the watcher to close the window right after it appears...
var watcher = {
  observe: function(subject, topic, data) {
    if (topic == "domwindowopened") {
      // unfortunately you can't get anything useful from subject here.
      // You need to wait for it to load. The best way to do 
      // that is to hook it's load event:
      subject.addEventListener("load", function() {  _firebug.log("hello, there was a load event"); }, false);

      // close the modal dialog window
      window.setTimeout(function() {  _firebug.log("goodbye, now closing the dialog window");  subject.close(); }, 1000);
    }
  }
};

ww.registerNotification(watcher); 

// The alert should now close right after it appears
win.alert("Hello!")
// Yeah!!!

// Don't forget to unregister the watcher, again!
ww.unregisterNotification(watcher)