It also contains Xposed module which allow them to work correctly under FireOS 6.
Google TV Search
Google TV Market
Android TV Settings
Rooted FireTV under FireOS 6
Just flash .zip from TWRP recovery or from Magisk Installer from Modules / Add
There will be automatic restart after first run (wait for it)
Play Store downloads not fully compatible with Amazon download manager. In case apps won't install from Play Store - uninstall Play Sore updates from ATV Settings.
You need to remove and readd Google account after module update.