“Haha, Razer likes to add RGB lights to stuff.” It’s an easy joke to make for a tech reporter, and I confess that I’ve indulged in it more than once. But to tell the truth, Razer’s products are generally very stylish and distinctive, and lately they’ve been using RGB lighting as subtle accents rather than an up-front selling point. But the Firefly V2 Pro mouse pad is all-RGB, all the time. Razer has made USB-connected, RGB-infused mousepads before, to the point that you can now find imitators on Amazon for just a few bucks. Generally they just embed a strip of lights around the edge of a cloth…