ResolutionThunderbolt and FireWire storage devices are supported in Parallels Desktop 9 for Mac. Parallels Desktop 9 for Mac does not provide support for non-storage FireWire devices.
Thunderbolt and FireWire devices are not supported by Parallels Desktop 8 and earlier.
Note: If you are trying to connect a FireWire External Storage Device to your virtual machine, you may follow this article:
5161 Using Firewire and USB 2.0 External Storage Devices