Protonmail has a Tor Hidden Service since early 2017 (https://protonirockerxow.onion/, as described here: https://protonmail.com/tor).

It would be nice if protonmail-desktop-app had an option to connect through onion address instead of mail.protonmail.com for extra privacy for TOR users (no need for stream isolation, no exit node)

Also, as .com TLD is owned by USA, i'd recommend to use "app.protonmail.ch" instead of "mail.protonmail.com" as default domain. this is the original hostname for protonmail service, and it is owned by switzerland as are they server, so we keep theorical attack surface smaller (read this: https://protonmail.com/support/knowledge-base/what-is-the-difference-between-protonmail-com-and-protonmail-ch/).

I am used to submit pull requests, but i took a look in the code and have been scared as i never wrote a single line of typescript :/

Anyway, your tool is one of the rare tools that allows automatic connection to protonmail, and it is super nice. Thank you for the awesome work.