for a firefox sync account that had stopped working (dont know why and got fed up trying to fix) so i deleted the account in the hope of setting up a new one from scratch that will work. however when setting up im told "that email address is already in use" so i cant use it!!!
just what was the point of deleting the account in the first place to rectify the problem of yours useless sync system deciding my password was wrong for no reason then refusing to allow me any way to reset it.
its like you actively are trying to make users move to chrome. you seem to spend all your time making firefox look and act ever more like chrome but with none of the speed or polish. for F's sake if i wanted chrome id bloody use it.