Difference between geckodriver and marionette [duplicate]

Question

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• Difference between webdriver.firefox.marionette & webdriver.gecko.driver 3 answers

I don't fully understand the difference between geckodriver and marionette.

• Can anyone clarify the difference between them?

For example, when I use Selenium WebDriver to control a Firefox browser, I need a geckodriver binary to listen the WebDriver protocol from Selenium.

• Is Marionette the Firefox extension that actually drives Firefox?

Answer 1

Selenium uses W3C Webdriver protocol to send requests to Geckodriver, which translates them and uses Marionette protocol to send them to Firefox

Selenium<--(W3C Webdriver)-->Geckodriver<---(Marionette)--->Firefox