Not asked for my passwort

I setup this IAM (Firefox) Account and used a strong password for it.

But from now on Firefox do not ask me for that password anymore. I logout from IAM/Discourse. And the next time I am redirected to a login landing page. But there is no question for a password. There is just my name and a login-button. Not more.

So somewhere my password is stored.

Inactable and unsecure!

Tell me technical details and how I can switch that off?

This also indicates that Mozilla can track my activity because my Firefox is always logged in no matter if I logged out myself.