I have no interest in MITM proxy which essentially breaks SSL, making all but pointless. (Sorry to be blunt).
I've decided to uninstall Squid. A comment hit home to me. Installing another application, putting my firewall packets through ANOTHER application, simply for a (secondary) virus scan. Not worth it. (As far as I know), (knocking on my wood shelf), I haven't had an issue with a virus since I can remember. I'm not saying it's a risk. I'm very aware of the need for a good virus scanner, but to add another layer to my firewall? Nah.
Squid is officially retired in my book.