Keepass usage seems pretty widespread. Okay Keepass doesn't integrate too well into browsers. But then why not just fix Keepass?
There have been way too many products pushed out failed utterly and abandoned by mozilla in the last few years. Why should I care about this one, if it doesn't even tell me what it wants to do better than other products.
The text on the website reads like this is simply a POC for a new built-in password manager in firefox, is that correct? But then why standalone?