Driver Service On Http Localhost Selenium Firefox C | Cannot Start The

The error in Selenium for C# typically occurs when the geckodriver.exe (or another driver executable) fails to launch or bind to a local port before a hard-coded timeout (often 2 seconds). Top Causes and Resolutions

If you are not using the NuGet package method, the code doesn't know where geckodriver.exe is. The error in Selenium for C# typically occurs

(including hidden background processes). On Windows: Task Manager → kill all firefox.exe . On Mac/Linux: pkill firefox The error in Selenium for C# typically occurs

using OpenQA.Selenium; using OpenQA.Selenium.Firefox; using System; The error in Selenium for C# typically occurs