An option to remember the Email after log in
Currently the add-on and desktop apps stores the Email field of the last successful log in with no way to opt out or even clearing the field. The feature would give the choice whether the add-on remembers the Email or not.
This could either be a Remember Email checkbox like the web vault or an option in the settings to not store the Email.
This choice would allow for more privacy and security, if one is using the add-on on a shared computer or using a unique Email for the password manager. It also gives the user more agency and seems like an option that should be there by default