On an XP machine, when I immunize, Firefox files remain. Firefox is not in use.
Do those un-immunized files really still exist? If so, where might they be, so I can remove them.

When I say Firefox is not in use, I mean that it is not an installed program. Presumably it was at some time. Maybe it was not uninstalled properly. I have no knowledge of how Firefox works, or where its files reside.

Help would be much appreciated.