Fire bug does not need extra ammo or gas tanks. Just like every one else said it makes the class to ez. Maybe it should have a alternate fire that uses up 2x as much ammo but does more damage or changes the fire from a stream to a wider fan/wall of fire. It also should get a tier 3 weapon maybe a fire axe that's on fire? Or does fire nades count as 3 weapons?
Ah... Alternate fire for the flamethrower, I'd like to see.
I always imagined it'd be nice to have an alternate fire in the flame thrower, which consumes say; 10 ammo, and puffs out a circular fireball that fades over distance. Instead of using the single fire line to take down a mob in a corridor, fire a fireball... I'd also imagined something pretty much exactly similar to what I just said; Except that it explodes on impact, and would basically be like the Incindenary grenade.
But, that's just thinking silly, isn't it?
I remember someone on another thread mentioning that, the issue with firebug is their core feature; Burning. That it takes too long to burn things
(Like how in harder levels, Gorefast can still get to you before burning out, unless you spray it.)
Personally, I don't find that ammo is what's wrong with Firebug at the moment, but a general lack of fire burny-ness. The firebug already has the best ammo capacity
(Though, not magazine/tank capacity since it is limited to like; 4 or something) to wildly spray around. Why double that...?
Though I wouldn't have a clue how you could change (After)Burning damage that wouldn't make it overpowered...