Update

fis/MainWindow.axaml.cs

@@ -130,7 +130,7 @@ namespace fis
                     MaximizeWindow();
                 });
 
-                BrowserManager.MainBrowser.ShowDeveloperTools();
+                //BrowserManager.MainBrowser.ShowDeveloperTools();
 
             };
             //Make cross domain work.

fis/SlaveWindow.axaml.cs

@@ -178,12 +178,12 @@ namespace fis
             MinHeight = size.Height;
             var scriptObj = new FisBrowserScriptObject(BrowserManager.SlaveBrowser);
             BrowserManager.SlaveBrowser.RegisterJavascriptObject(scriptObj, JSObjectName);
-            BrowserManager.SlaveBrowser.BrowserInitialized += () =>
-            {
+            //BrowserManager.SlaveBrowser.BrowserInitialized += () =>
+            //{
 
-                BrowserManager.SlaveBrowser!.ShowDeveloperTools();
+            //    BrowserManager.SlaveBrowser!.ShowDeveloperTools();
 
-            };
+            //};
             var browserContainer = this.FindControl<Border>("BrowserBorder");
             browserContainer.Child = BrowserManager.SlaveBrowser;
             browserContainer.BorderBrush = Brushes.Gray;