[dotnet] only add websocket-port if connectToRunningBrowser is not set

Author: titusfortner

dotnet/src/webdriver/Firefox/FirefoxDriverService.cs

@@ -159,6 +159,10 @@ protected override string CommandLineArguments
                 {
                     argsBuilder.Append(" --connect-existing");
                 }
+                else
+                {
+                    argsBuilder.Append(string.Format(CultureInfo.InvariantCulture, " --websocket-port {0}", PortUtilities.FindFreePort()));
+                }
 
                 if (this.browserCommunicationPort > 0)
                 {
@@ -195,8 +199,6 @@ protected override string CommandLineArguments
                     argsBuilder.Append(" --jsdebugger");
                 }
 
-                argsBuilder.Append(string.Format(CultureInfo.InvariantCulture, " --websocket-port {0}", PortUtilities.FindFreePort()));
-
                 return argsBuilder.ToString().Trim();
             }
         }