For some reason I have it in the back of my mind that they were at one point accused of being a honeypot for US intelligence because of their association with MIT. Probably complete BS, but maybe not. Are they as open source as they claim to be? Looks like they’re on github. F-Droid seems to think they have some Google libraries or whatever that they use.
ProtonMail users, how do you like/dislike it?
Not 3rd party of course but most of their official clients are FOSS.
Because you don’t. I haven’t looked into how it works exactly but all your browsers sends is your username and a proof of you having access to the password