1) It's a general joystick api, not just xbox.
2) You can't actually use an xbox controller with a computer (and hence with firefox) anyway without a USB cable. You could use a 360 controller, but not the first Xbox.
2) You can't actually use an xbox controller with a computer (and hence with firefox) anyway without a USB cable. You could use a 360 controller, but not the first Xbox.
USB xbox 360 controllers don't need any installation last I checked.