Far from perfect. It is not very consistent, sometimes it fails to capture the username, sometimes the password in quite a few websites: about 1 in 10 websites has some kind of problem, my bank (piraeusbank.gr), my Camscanner login (v4.camscanner .com) and politico.eu login page, among others. In the case of politico.eu, the login would completely fail: I couldn't login at all unless I uninstalled the add-on. I have reported these pages, but nothing happened.

I installed Proton Pass because I wasn't happy with Firefox's default password manager either, but since it isn't perfect, I don't see what the advantage is over the (also not perfect) Firefox default password manager: all that changes is which websites don't work. I suspect my problems are Kubuntu Firefox-specific, but the result doesn't change. I'll return to Firefox default password manager for now