After the changes to their TOS I lost any trust I had in Proton

Service is fine, but GNU/Linux support needs improvement.

They just changed their TOS to forbid paying customers from seeking any form of judicial remedy, so you can guess the direction they’re headed.

Needless to say I won’t be renewing.

As many others have pointed out Arkenfox is a great way to harden Firefox that saves much of the effort of manually editing about:config

Because I didn’t see one already here’s a link to an install tutorial for Arkenfox in case it helps anyone to get started.