Well I don't use any so can't recommend a specific one, but I know they exist.


Couple places to look though, but you can do some Google searching for more.


http://www.dirfile.com/freeware/form-filler.htm

http://forums.mozillazine.org/viewtopic.php?p=3020271&

http://www.filedudes.com/files/Auto_Fill_Forms.html