Hi there.

As I see, the problem in the following thread is the pw-management of firefox.

www.joomlapolis.com/component/option,com_joomlaboard/Itemid,/func,view/catid,10/id,8841/#8841

Sometimes, this pw-management is very useful. To fix the problem, it should be enough to rename the fields for the user an the password, for example to this_username and this_password.