User agent-based rendering, explains everything.
Whenever a password is asked, macOS uses a security feature called Secure Input.
Secure input is a macOS security feature that can be enabled & disabled by any app. Usually, this is used while password fields are active in order to prevent other apps from logging sensitive data.
I also use LuLu which is a FOSS version of Little Snitch to track any ongoing and outgoing network call of my machine. And if it looks suspect, I delete the responsible software.
You bet lol 