Subject lines are also not encrypted, unlike Tutanota.
Subject lines are also not encrypted, unlike Tutanota.
Safari on iOS supports extensions out of the box. You can just install adguard or something else and won‘t have any ads.
There are also third party browsers, which yes, use WebKit, but also can block ads.
I have a yubikey on my keychain for a few years now, no problems so far.
Btw, I would recommend to get at least 2, one you use and one as a backup.
They implemented their own way of doing this. They don‘t use PGP. I don‘t know how it exactly works, but it‘s open source, so you can look at it yourself.