Like the Super Smash Bros. series, in Super Smash Flash the Fire Flower emits a steady stream of fire and is held as an item rather than a power-up. Also, once it goes out, it completely disappears, unlike its appearance in the SSB game where one can throw the flower for fiery damage. The design of the Fire Flower resembles a daisy, which is the design used exclusively in Super Smash Bros. Melee.
In Super Smash Flash 2
In Super Smash Flash 2 the Fire Flower acts similarly to how it does in the Super Smash Bros. series, except instead of a stream of fire, it emits a short-ranged series of fireballs that act the same way. Once it can no longer shoot, it will emit a harmless smoke to indicate that. It can also be thrown for fiery damage, much like in the Super Smash Bros. series. The appearance of the Fire Flower is the current design used since Mario & Luigi: Partners in Time, which became a staple for the Fire Flower's design in following entries of the series.
The Fire Flower is one of the power-ups that debuted in the 1985 NES game, Super Mario Bros., and has become one of the most recurring power-ups in the Mario series. In the platform games it appears, when Mario, Luigi, or any character picks up a Fire Flower, they would gain the ability to shoot bouncing fireballs at enemies, gaining their Fire form. The color of their clothing would change as well, normally, being white with the corresponding character color, such as Mario's clothes changing to red and white.
The Fire Flower is also a recurring item is Mario spin-offs, such as Mario Kart and, as with the platformer games, it grants the ability to shoot fireballs at other drivers for a brief period of time; the Fire Flower is also the emblem of the Flower Cup.
Before being reintroduced as an item in SSF2, the Fire Flower was previously briefly seen whenever Mario started his original Final Smash to turn into Fire Mario. In early demos, two flowers appeared, but this was later changed to only one. This can no longer be seen as of v0.9b, as Mario's Final Smash was changed to Mario Finale.