Cannot Start The Driver Service On Http Localhost Selenium Firefox C |work| Jun 2026

from selenium.webdriver.firefox.service import Service

The error "cannot start the driver service on http://localhost" is rarely a bug in Selenium. It is almost always an environmental issue rooted in version mismatches, incorrect paths, or operating system restrictions. from selenium

var driverPath = @"C:\drivers\geckodriver"; // full folder path containing geckodriver.exe var service = FirefoxDriverService.CreateDefaultService(driverPath); service.HideCommandPromptWindow = true; service.Port = 0; // let system pick an open port service.HideCommandPromptWindow = true