Ok, so i am looking for a good USB hub for my MBP and would like it to be FW800 cause i really don't have any FW800 devices and i would like a usb hub that does not take up any of my existing usb ports.
I don't think such a thing exists for Firewire. You can, however, get WiFi USB hubs, which might solve your problem if most of your USB needs at home on your wireless network. They're not cheap, though.
If you really have 6 or whatever USB devices, either get a hub with more than 4 ports, or just get two adapters. Seems simple enough, no need to look for some crazy adapter that may or may not exist.
****, the reason i wanted it to be FW was that i already use the 2 existing hubs for my gaming KB and Mouse and don't want to have to unplug them every time i need more ports, i guess i will have to keep the hub plugged at all times