https://support.mozilla.org/en-US/kb/firefox-fire-tv
Mozilla Firefox for FireTV. Android TV
https://vigtv.com/channels/org.mozilla.tv.firefox
https://www.apkmirror.com/apk/mozilla/firefox-android-tv/firefox-android-tv-4-7-1-release/firefox-android-tv-4-7-1-android-apk-download/