The current FFox.SYNC for Passwords, would greatly benefit from a completely user defined field, to be displayed when logging into a particular site.
At present, differing sited either force their own ideas of what a login ID should be. Thus if you, the end user, were able to say something like "_FirstNames_ gmail login" or anything else, it would greatly help the end user, in determining exactly which login ID, to choose.
This also becomes and issue when one has multiple login ID's for the SAME site,
-or the case where one, by accident or choice, pre-created a pw, but then is forced by the login site use a differerent login ID. TimeStamping the userdefined field, and displaying it, would really help manage pw management.