void NavigateWithPostData(string URLToPOST, string POSTData)
        {
            var postData = MimeInputStream.Create();
            postData.AddHeader("Content-Type", "application/x-www-form-urlencoded");
            postData.AddContentLength = true;
            postData.SetData(POSTData);
            
            geckoWebF1.Navigate(URLToPOST, GeckoLoadFlags.BypassCache, geckoWebF1.Url.AbsoluteUri, postData);
        }
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geckoWebF1.Navigate("url");
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