var driver = new FirefoxDriver(options); // will search PATH driver.Navigate().GoToUrl("https://example.com"); Console.WriteLine(driver.Title); driver.Quit();

GitHub mozilla/geckodriver 4. Add Driver Path to System PATH (or specify explicitly) Option A – Add to PATH: Place geckodriver.exe in a folder already on PATH, or add its folder to system environment variables.

service = FirefoxDriverService.CreateDefaultService(); service.LogPath = "geckodriver.log"; service.LogLevel = FirefoxDriverLogLevel.Trace; var driver = new FirefoxDriver(service); Check geckodriver.log – it will show port binding failures, binary issues, or profile problems. using OpenQA.Selenium.Firefox; class Program

static void Main()

taskkill /F /IM geckodriver.exe