What does Symantec have to do with it? Threatfire is produced by PCTools.
It is still being developed and is in version 3 currently, I get updates every day. Your “Firewall for Theadfire” mainly comes away with that it’s badly coded. If we stop using everything that is badly coded, we wouldn’t have Windows or anything Microsoft based now would we?

I’m using K9 and Threatfire on two older laptops runnning Windows Xp, for over half a year now, and it has kept them both clean and Threatfire has alerted me on some dodgy software.
Neither machine is running any other active security software except for the firewall.

Once a month I do full scans with Avast, AVIRA, plus on-line scans for spyware, etc.

Now I’m saying anyone else should run without full active protection, but my two systems are so old that if I use anything else actively, they become unusable. The full scans alone take hours, and they can’t be used during the scans, either.

K9 does the most by not letting us be redirected to “bad” sites, so there is not a lot for Threatfire to do.