Skybound.Gecko.GeckoWebBrowser.AddMessageEventListener C# (CSharp) Method

        public void AddMessageEventListener(string eventName, Action<string> action)
        {
            nsIDOMEventTarget target = Xpcom.QueryInterface<nsIDOMWindow>(WebBrowser.GetContentDOMWindowAttribute()).GetWindowRootAttribute();
            target.AddEventListener(new nsAString(eventName), this, /*Review*/ true, true, /*what's this?*/2);
            _messageEventListeners.Add(eventName, action);
        }