The using directive for 'System' appeared previously in this namespace

The using directive for 'System.IO' appeared previously in this namespace

The using directive for 'System.Threading' appeared previously in this namespace

'WebClient.WebClient()' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'WebRequest.Create(string)' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

'Thread.Abort()' is obsolete: 'Thread.Abort is not supported and throws PlatformNotSupportedException.' (https://aka.ms/dotnet-warnings/SYSLIB0006)

'FirefoxOptions.BrowserExecutableLocation' is obsolete: 'Use BinaryLocation property instead of BrowserExecutableLocation. This one will be removed soon.'

The variable 'e' is declared but never used

The using directive for 'System' appeared previously in this namespace