It might be worthwhile revisiting how the password manager identifies a "signup" form. Signup forms present additional challenges vs login forms: * Signup forms often have multiple non-password inputs, so we may capture the wrong value as the username. * Signup forms sometimes use multiple password fields (to confirm the password), but not always. * If the user already has saved credentials for the site, ideally we don't want to autofill those when the user is trying to sign up for a second account. * Since password reset and change flows also use multiple password fields, it's possible our logic will get confused between these and signup flows.