can firewire port be adapted to USB multi port hub?

Have all USB ports used. I know your can get multi USB hub but have been told that will slow some devices down. So was wondering if there is a adaptor to use the firewire ports for USB multiport.

Moshi 800 to 400 FireWire Adapter

Moshi 800 to 400 FireWire Adapter

Product No Longer Available

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