|I can see why you would like to go down the path of removing your FireWire port and replacing it with a USB 3.0 port instead. Not sure how nice it would look even carefully filed away to match the USB size. To do this though you would need to purchase a USB 3 cable of some sort. Something like this:|
The USB 3 headers on the motherboard are a different shape and size to the USB 2 ones. They are bigger with more pins.
A few motherboard manufacturers also provide a USB 3 panel designed to slot into an optical drive bay if you have a spare one. They used to do this when USB 3 was new to accomodate for the shortage of cases that were catching up with the new technology. I couldn't say if this is still commonplace. You can also buy these panels online easily enough.
Here's one I found on eBay:
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