hi, the request for a master password should kick in once you are on a password form that should auto-complete with your username and password or once you try to access the stored passwords through the firefox options > security panel. [[Use a Master Password to protect stored logins and passwords]] when a website just uses a cookie to recognise you in a new browsing session and logs you in automatically, this is not a use-case for the master password. in this case you'd have to alter the cookie settings in firefox or specifically for pages where you don't want to get automatically signed in: [[Enable and disable cookies that websites use to track your preferences]]