Like in LastPass, you can grab all fields and create a complete card with a lot of informations typed at registering (not only password/username)
And you can make even better than LastPass if we don’t need to manually do it each time. Because with LastPass you need to make like 4 clicks each times. So you can ask to save all fields each time you detect a validation with a password field (or email one, like you want, sometimes some websites work without password, so it’s a way to work)