CSS and Firefox

[truk]

CSS can link passwords in firefox to fingerprints, but it only allows once per login or always as options, and the default seems to be an unchangable once per login. I like the way firefox stores my passwords, once per time of opening the browser, since my laptop can stay logged in for days if I'm using the tablet at school. My problem is that I want to use fingerprint login with the default firefox password manager. CSS will only store passwords for sites through firefox. I've tried disabling the extension, disabling saving firefox passwords through the CSS options, changing the name of firefox, and using the type and transfer tools. It will not let me save the firefox master password to fingerprint. Anyone have any idea how to do this?
THANKS