Firefox Android 81 is shipped, 82 is beta and 83 is nightly. (#6780)
Firefox Android 81 is shipped, 82 is beta and 83 is nightly. (#6780)

Release data of 81 is September 22, 2020 (https://www.mozilla.org/en-US/firefox/android/81.0/releasenotes/).
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data