A suggestion Rated 4 out of 5 stars
A great addon. However, adding one more feature will complete the addon(if it is not too hard to implement):
On websites whose password is already stored, the key icon is seen in a different colour(say silver colour for example). On clicking it, it logs you in. If a person has stored multiple passwords, then clicking the silver colored key shows you a popup menu to select the account you wanna login into.