Cannot Start The Driver Service On Http Localhost Selenium Firefox C [updated] May 2026

Right-click your project -> Manage NuGet Packages -> Update Selenium.WebDriver and Selenium.WebDriver.GeckoDriver .

Security software is blocking the driver's execution. Right-click your project -> Manage NuGet Packages ->

Ensure you aren't running an old version of GeckoDriver with a brand-new version of Firefox. Right-click your project -> Manage NuGet Packages ->