The short answer is basically, no. FireWire and USB are different architectures, a simple adapter will not do the trick.
It is possible to connect FireWire peripherals to a Thunderbolt-capable Mac, though you'd need a couple of adapters, the first of which is no longer made (Apple's Thunderbolt to FireWire adapter and Apple's Thunderbolt 3 to 2 adapter). But that first adapter is unidirectional, meaning you can use it for a FireWire peripheral but not to connect things to the FireWire port on an older Mac.