public sealed class WindowBrowserCreator : nsIWindowCreator2
    {
        public Form m_Parent;
        public TabControl tabControlMain;
        public WindowBrowserCreator(Form p_Parent)
        {
            this.m_Parent = p_Parent;
        }

        public nsIWebBrowserChrome CreateChromeWindow(nsIWebBrowserChrome parent, uint chromeFlags)
        {
            bool bCancel = false;
            return CreateWindow(parent, chromeFlags, 0, null, ref bCancel);
        }

        public nsIWebBrowserChrome CreateChromeWindow2(nsIWebBrowserChrome parent, uint chromeFlags, uint contextFlags, nsIURI uri, nsITabParent aOpeningTab, ref bool cancel)
        {
            return CreateWindow(parent, chromeFlags, contextFlags, uri, ref cancel);
        }

        private nsIWebBrowserChrome CreateWindow(nsIWebBrowserChrome parent, uint chromeFlags, uint contextFlags, nsIURI uri, ref bool cancel)
        {
            GeckoWindowFlags flags = (GeckoWindowFlags)chromeFlags;

            if ((flags & GeckoWindowFlags.OpenAsChrome) != 0)
            {
                // create the child window
                nsIXULWindow xulChild = AppShellService.CreateTopLevelWindow(null, null, chromeFlags, -1, -1);

                // this little gem allows the GeckoWebBrowser to be properly activated when it gains the focus again
                if (parent is GeckoWebBrowser && (flags & GeckoWindowFlags.OpenAsDialog) != 0)
                {
                    EventHandler gotFocus = null;
                    gotFocus = delegate(object sender, EventArgs e)
                    {
                        var br = (sender as GeckoWebBrowser);
                        if (br != null)
                        {
                            br.GotFocus -= gotFocus;
                            br.WebBrowserFocus.Activate();
                        }

                    };
                    var parBr = parent as GeckoWebBrowser;
                    parBr.GotFocus += gotFocus;
                }

                // return the chrome
                return Xpcom.QueryInterface<nsIWebBrowserChrome>(xulChild);
            }

            nsIWebBrowserChrome oBrowser = AddNewTab();
            oBrowser.SetChromeFlagsAttribute(chromeFlags);
            return oBrowser;
        }

        public void SetScreenId(uint aScreenId)
        {
            throw new NotImplementedException();
        }

        internal nsIWebBrowserChrome AddNewTab()
        {
            GeckoWebBrowser gwBrowserTabPop = new GeckoWebBrowser();
            TabPage oTabPage = new TabPage("New Tab");
            Padding oPadding = oTabPage.Margin; oPadding.All = 0;
            oPadding = oTabPage.Padding; oPadding.All = 0;
            oTabPage.Controls.Add(gwBrowserTabPop);
            gwBrowserTabPop.Dock = DockStyle.Fill;
            tabControlMain.TabPages.Add(oTabPage);
            return gwBrowserTabPop;
        }
    }