How about just using a password manager and create a unique strong password for every website? That way you don't have to store so much in your brain and you get better security on any website. You also don't have to worry about more than one website being breached from reused passwords.
BitWarden is pretty great and is open source and free to use.
You can also self-host it if you don't trust them storing your hashed passwords.
I'm considering it, but how does thorium handle Google's recent Web manifest updates that break true ad blockers like uBlock origin?
I've been pretty happy with the customizability of librefox with the userchrome.css and ublock still works with YouTube.