pop up from mozilla & firefox

Usually because you've allowed some sites to send you notifications — if what you're referring to is this kind of boxes cropping up in the corner of the screen: support.mozilla.org/questions/1459930

Instructions how to revoke the permissions granted earlier are covered in Web Push notifications in Firefox

ITS' A POP UP WANTING MY PRIMARY PASS WORD FROM MOZILLA & FIREFOX IN THE MIDDLE OF MY SCREEN.

GARY

IT'S A POP UP IN THE MIDDLE OF MY SCREEN FROM MOZILLA & FIREFOX WANTING MY PRIMARY PASSWORD.

It's possible some site is asking for stored passwords then.