Manipulating HTML document before displaying into WPF WebBrowser control

I have to change inner html code before showing it in the WebBrowser.

Test page - http://aksmod.ru/skajrim-mod-kukri-ot-aksyonov-v5-0/

I tried to use AngleSharp.Scripting but it doesn't work correctly (the ads doesn't load)

var config = new Configuration().WithDefaultLoader().WithJavaScript();
var document = BrowsingContext.New(config).OpenAsync(address).Result;

//do something 

return document.DocumentElement.OuterHtml;

later I thought about LoadCompleted, but the result was the same

private void Wb_LoadCompleted(object sender, NavigationEventArgs e)
{
    Console.WriteLine("Loaded");
    string url = e.Uri.ToString();
    if (!(url.StartsWith("http://") || url.StartsWith("https://")))
    { }
    if (e.Uri.AbsolutePath != wb.Source.AbsolutePath)
    { }
    else
    {
        Console.WriteLine("Full Loaded");
        HTMLDocument html = (HTMLDocument)wb.Document;
        var value = html.getElementsByTagName("html").item(index: 0);
        //do something
        wb.NavigateToString(value.OuterHtml);
    }
}

the event just doesn't fire (it works fine for some other sites, although).

So, what I am missing to do it?

Update 1

MCVE

XAML

<Grid>
    <WebBrowser Name="wb" />
</Grid>

Code behind

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        wb.Navigated += Wb_Navigated;
        wb.LoadCompleted += Wb_LoadCompleted;
        wb.Navigate("http://aksmod.ru/skajrim-mod-kukri-ot-aksyonov-v5-0/");
    }

private void Wb_LoadCompleted(object sender, NavigationEventArgs e)
{
    Console.WriteLine("Loaded");
    string url = e.Uri.ToString();
    if (!(url.StartsWith("http://") || url.StartsWith("https://")))
    { }
    if (e.Uri.AbsolutePath != wb.Source.AbsolutePath)
    { }
    else
    {
        Console.WriteLine("Full Loaded");
        HTMLDocument html = (HTMLDocument)wb.Document;
        var value = html.getElementsByTagName("html").item(index: 0);
        //do something
        wb.NavigateToString(value.OuterHtml);
    }
}

    private void Wb_Navigated(object sender, NavigationEventArgs e)
    {

        FieldInfo fiComWebBrowser = typeof(WebBrowser)
            .GetField("_axIWebBrowser2",
                      BindingFlags.Instance | BindingFlags.NonPublic);
        if (fiComWebBrowser == null) return;
        object objComWebBrowser = fiComWebBrowser.GetValue(wb);
        if (objComWebBrowser == null) return;
        objComWebBrowser.GetType().InvokeMember(
            "Silent", BindingFlags.SetProperty, null, objComWebBrowser,
            new object[] { true });

        Console.WriteLine("Navigated");
    }
}