Emits NavigateFinished when a navigation has completed.
        /// <summary>
        /// Initializes a new instance of <see cref="GeckoWebBrowser"/>.
        /// </summary>
        public GeckoWebBrowser()
        {
            #if GTK
            if (Xpcom.IsMono)
                m_wrapper = new GtkDotNet.GtkReparentingWrapperNoThread(new Gtk.Window(Gtk.WindowType.Popup), this);
            #endif

            NavigateFinishedNotifier = new NavigateFinishedNotifier(this);

            // Optimize: only enable Console Message Notification when event handler attached to ConsoleMessage Event.
            EnableConsoleMessageNotfication();
        }