Support for Geckodriver (Firefox driver) within Appium
https://appium.github.io/appium-geckodriver/ ↗// readme
Appium Geckodriver
This is Appium driver for automating Gecko-based browsers (such as Firefox) and webviews on different platforms, including Android.
[!IMPORTANT] Since major version 2.0.0, this driver is only compatible with Appium 3.
Documentation
You can access the documentation here: https://appium.github.io/appium-geckodriver