From the chapter headings:

LibreWolf

Zen Browser

Mullvad Browser

Tor Browser

Vivaldi Browser

Ladybird

Orion Browser

Brave

He has some really good, in-depth youtube explainer videos on LLMs. That said this bit on Apple Intelligence does not seem to reflect what people are experiencing.

Go read the FIDO threat model if you want to understand how it protects against specific attacks. It is pretty secure.

https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-security-ref-v2.0-id-20180227.html

It is hard to do well which is why I worry. Google probably has the best overall account security, you could fo worse than modeling after them.

The short answer to your question is Passkeys. But you need a whole system of account recovery around them.

I love Lemmy and Voyager and the Fediverse. That said, if it were to become mainstream I forsee some problems. The fact that the login relies on only passwords is pretty terrible. Also, this makes the service vulnerable to bots, sock puppet accounts, brigading, etc.