User configs by host(IP) and/or client(browser)

One of our Debian users requested the following feature; see http://bugs.debian.org/231164:

From: "Mike Mestnik\) \(The Archmage Forever" <cheako@train.is-a-geek.org>
Subject: privoxy: User configs by host(IP) and/or client(browser).

I find alot of ppl on the web have varying fealings about lets say pop-ups. ppl who use mozilla or fierbird generaly wan't popups. while the default for other browsers should be to block. Also some users who use mozilla may just as well have privoxy do the blocking.

This creates the need for more configurable rules. I think it will work if [ and ] are used to establish what the following Actions are for. I.E.

[ client=Mozilla.*Debian ]
{ -popups )
/

[ host=joe ]
{ +popups )
/

[ client=Mozilla ]
{ +popups )
/

[ ]
{ -popups -ads )
/