How to prevent a new window from being opened in geckofx?

You can use the CreateWindow event to handle the new popup:

GeckoWebBrowser wb1 = new GeckoWebBrowser();
wb1.CreateWindow += new EventHandler<GeckoCreateWindowEventArgs>(wb1_CreateWindow);

      

        
        
        
      

    

Here's the CreateWindow event:

void wb1_CreateWindow(object sender, GeckoCreateWindowEventArgs e)
{
    //Keep popup new window here!
    e.Cancel = true;

    //e.WebBrowser.Navigate(e.Uri);

    // OR

    //GeckoWebBrowser wb1 = new GeckoWebBrowser();
    //wb1.Navigating += new EventHandler<GeckoNavigatingEventArgs>(wb1_Navigating);
    //wb1.Dock = DockStyle.Fill;
    //wb1.CreateControl();
    //TabPage tab1 = new TabPage("New WebBrowser");
    //tabBrowser.TabPages.Add(tab1);
    //tab1.Controls.Add(wb1);
    //wb1.Navigate(e.Uri);
}