Firewire 800/HDMI

I have a late 2009 Imac. Presently, I have an external monitor hooked up through the mini display port. I have an adapter that converts the mini display to HDMI.

I would like to hook up a third monitor and i am wondering if the Firewire 800 port can be used for that purpose. Is there some sort of adapter that would convert the Firewire800 cable to with HDMI or DVi or something like that? Is it possible to use the Firewire 800 port to hook up to a monitor?

Thank-you for your time and expertise!