Re: backing my firefox
for backup search the mozilla site for extesion FEBE
for passwords go to tools-options-security-password and check the option "remember password for sites" , now it will ask you first time whenever u loggon to any website, it gives u option to remember or not to remember ( banking sites r excluded, even though FF saves the password, it won't work, u have to type those again, but since it is banking site that will be a good practice). once the passwords r stored, next time u need not to type those, user name & passwords automatically appeared and u only have to press signin/login.
i hope both answers have solved ur query