GeckoDriver

GeckoDriver is the essential proxy for linking Selenium WebDriver clients to Mozilla Firefox browsers.

GeckoDriver implements the W3C WebDriver protocol to act as a bridge between HTTP-based automation scripts and the Gecko engine. It translates incoming requests into Marionette (the Firefox remote protocol) to execute actions like clicking elements or navigating URLs. Since Firefox 47, this standalone executable is mandatory for automated testing. It supports cross-platform execution on Windows, macOS, and Linux, ensuring consistent browser behavior across CI/CD pipelines.

https://github.com/mozilla/geckodriver