Review for Autocrypt by richmoz
Rated 1 out of 5 stars
Promises end-to-end encryption but instead makes you uninstall the safer Enigmail and uses a protocol wide open to man in the middle attacks.
https://mail.mozilla.org/pipermail/tb-planning/2019-December/007318.html
To create your own collections, you must have a Mozilla Add-ons account.