My SSH keys are protected with a password, on top of that I have a biometric lock (MacBook fingerprint reader) on my SSH keys. So they would only grant access to someone that 1. has access to my computer, 2. knows the password (which only I know) and 3. has my finger. Definitely more than just plain text!

I strongly suggest looking into multi-factor authentication, or other modern authorization/security mechanisms if you want to see examples of security systems that are not just plain text.

> Chromium does not display it.

Security by obscurity is not ideal, although I can understand that the lack of this feature in Firefox hinders your usecase.