Sites can accidentally or intentionally include URLs constructed with /PRIVOXY-FORCE in them and will auto bypass Privoxy. The string should be stripped from incoming URLs. Many blog entries from Privoxy users accidentally paste ad URLs with the string and this site:
demonstrates an intentional use.
Perhaps it could be done with a filter, but it seems like it should be an internal default.
SF login gbsi3
Firefox 3.6 Privoxy 3.0.16 Win XP SP3