Here is the second article dedicated to the configuration of pfSense® software. This tutorial will allow you to configure your pfSense box as a bridge. 

This setup is very usefull if you are hosting a server within an ISP facility, for example if your provider / hoster is providing you a bloc of IP you do not wish, you can configure your firewall as a bridge so that you can filter packets and at the same time use your public IPs which have been alocated to you.  

Please note that you can find this tutorial on the pfSense® website. 

It has been written by M. Fuchs, a French translated version is available here