Monitor Traffic to Webserver
I would like to view computers viewing websites on my server the server address internal is 192.168.1.120, how is this done
The simple way is to just look at you webserver log - there are shit ton of tools and methods for parsing through the webservers access logs.. Give you username if they auth, what pages they hit, when they move to a different page, etc.
If your not running a reverse proxy on pfsense all it would tell you is what IP got forwarded to your webserver IP on port X, etc. if you enable logging of your port forward..
Such information is better handled on the webserver directly.