fire·bomb 
(fīrbŏm′)
(fīrbŏm′)n.
A bomb used to start a fire; an incendiary bomb.
v. fire·bombed, fire·bomb·ing, fire·bombs
v.tr.
To attack (a target) with a firebomb.
v.intr.
To launch an attack against a target, using a firebomb.
firebomb′er n.