With FireFox Tools-options-privacy-saved passwords click to open click view password, then you can add WC.
For IE6 autocomplete seems to be hit and miss, never asks to save password for one of my banking sites, other
asked first time and was been there forever, for some sites has asked to save like 8 or 9 times before it
saves it. One site I use password for FF asked first time to save, IE6 never has in about 50 visits to that site.
As far as WC both FF and IE6 asked and saved first time for me. Could be settings problems IE6 but which I would
not know. Maybe this is not much help, but you know your not the only one with saving passwords for sites that use
them problems.