The real question is why anyone would sign up to such things using a "real" password. I've lost count of the number of jobsites and so on that I registered for with a random string knowing that a) Firefox would remember it and b) On the off chance it doesn't, and I get through to a stage where I ever need the password I can just recover/reset

Signing up for websites that have limited/no repeat value is part of everyday life and I don't have high expectations of them