Is it possible to configure squid to listen on multiple ports, say 3128 and 8080

[avdh]

Is it possible to configure squid to listen on multiple ports, say 3128 and 8080?

[Kababayan]

Yes put this to custom adv opt.
http_port  8080 
if you use enable ssl you can use something like below
http_port  8080 ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=10MB cert=/usr/local/etc/squid/serverkey.pem capath=/usr/local/share/certs/  ;

assuming you use the latest squid package from pfsense repo and pfsensen 2.3.2. not sure if it will work other version. the first one should work on all version. https will only tunnel.