Hi again,
There are some problems with the Squid package (or maybe not) and probably the inerent rules it creates (that I don't know how to see them).
To have access from a workstation to the Net (HTTP, HTTPS, FTP) with or without Squid I had to:
1. configure Squid in transparent mode (still I can use it manually by chosing de IP from pfSense and the port 3128 (I usualy chnage the Squid port to 3328).
2. Service -> Squid ->Network Access Control - Allowed Subnets -> 192.168.1.0/255.255.255.0
3. Edit /usr/local/etc/squid/squid.conf and change the line "http_access deny !pf_networks" to "http_access allow pf_networks". This was the only way I found to get HTTPS and FTP, besides HTTP, working under Firefox with a manually configured proxy.
I don't know if this helps anyone or anyone can help me.
Best Regards,
Joao