I have set a master password for firefox Logins and Passwords. When I try to look at Passwords sometimes the login screen pops up to allow me to enter the Master Password. Other times I get the screen (see attached photo) that has a login button. When I click the button the screen flashes but does not pop up a password window. If I close all tabs and other windows of firefox browser then start only one firefox browser window it will ask for the master password. That fixes it temporarily but I have to close many tabs and several firefox windows.