MacBook Pro with Dual Monitors
The port between the Ethernet port and the Thunderbolt port is a FireWire 800 port.

On the MacBook Pro 2011 17" the Thunderbolt port supports up to two Thunderbolt displays.

As to using the FireWire port to support a display I do not know for sure other then this article essentially says no.


  USB and Firewire for two or more displays?
  
  Apple famously championed the Firewire standard a few years ago but
  you simply can’t attach a monitor via Firewire. Firewire can receive
  video signals from the likes of digital video cameras but isn’t
  designed to output them.