Fireworks

Fireworks is a Tier 2 Perk in Call of Duty: World at War. This perk increases the damage of all explosive weapons such as M9A1 Bazookas, Frag Grenades, Satchel Charges, and Bouncing Betties. Fireworks cancels out and is canceled out by Flak Jacket. This perk is available at level 1.

Tactics
If one desires to have an 'anti-tank' class, this perk is highly recommended, along with Extreme Conditioning and Satchel Charges. A bazooka can also be used as it takes much less time to destroy a tank, about 2 rockets and one sticky to the back of a tank will destroy it.

This perk will allow you to have a higher probability of killing players with Martyrdom, but is very underused in favor of perks such as Stopping Power or Overkill.

A sniper might find this useful as it makes Bouncing Betties more reliable in defending their position. However, most snipers refuse to sacrifice Stopping Power, because if they have Fireworks, they will have to get headshots for one-hit-kills.

Players who use high powered weapons such as the MP40, Thompson, Type 100, DP-28, MG42 and the M1919 benefit most from this perk, as they still have a large amount of fire power without the damage-boosting Stopping Power.

In Hardcore, this perk is useless along with perks such as Stopping Power and Juggernaut, as an explosive will kill someone at the tip of its radius without it.

Players who use the Rifle Grenade attachment can commonly be found using this perk, as it allows for more splash damage to be done and therefore reduces the accuracy required for each shot.

Players who like to do "Team killing", find this perk useful for more splash damage with the bazooka and rifle grenade.