The Firework is a weapon that, once fired, turns into a firecracker with a homing-missile style attack at the nearest car. A car that is being targeted is marked with a rotating, colored reticle; green if it's you, or red if it's an opponent. They are classified as Fireworks when they come in packs of three.
Fireworks should be launched at medium range. If the target is too far, the firework may miss. If the target is too close, you may also get hit by the returning explosion.
Fireworks can also push a ball away.