Seems a bit late to get in the password-manager business, where you have plenty of incumbents (1Password, LastPass, Bitwarden, KeePass...) offering a plethora of features. The Mozilla audience likely overlaps most of the target demographic for such products already, and persuading people to switch will be very hard.

It could make sense if Mozilla were to develop a standard interface for all password managers, so I could swap implementations under the hood without having to deal with their (occasionally half-baked) extensions.

But I guess this is just a Big Rewrite of the venerable utility we've been using since the dawn of Moz.