I'm quite happy with the Mullvad browser.

Another vote for Bandcamp. It's a fantastic service, honestly.

The thing that put me off of Tuta is that you cannot use it with any other mail client (like Thunderbird, for example).

Posteo really doesn't get enough acknowledgment, in my opinion. They're a great and secure email service that seems to fly under the radar for most people. I recommend checking them out.