The Firefly is a rocket launcher with a similar design to the HEV Mk 51, featuring moderate damage (but with maximum armor penetration). The Firefly, however features decent mobility and higher-than-average reserve ammunition (with a total of 5 rockets with the Boombastic skill fully upgraded).
In addition, the Firefly's special mechanic causes its rockets to detonate with a toxic DOT effect which lingers in the area for a few seconds. (The effect is comparable to that of the Toxic Area Armor Core. However, the Firefly's toxins linger in the blast area for a much shorter duration - approximately 5 seconds).
Overall, the Firefly is considered an underpowered weapon for its tier due to its mediocre-overall damage output, slow reload speed, and low mobility, leading to it being potentially surpassed by the COM 4 and SLAK 7H
Maximum armor penetration
Decent reserve ammuntion
Unique chemical warheads with DOT effect
Fairly low rate of fire
Very low mobility
Chemical DOT area lingers on the map for very short time
Around the time of its release, a bug was existed where Firefly despite being a prestige weapon, the icon when received a BluePrint from a weapon pack had a bronze background. The bug was fixed later on, now currently, the gold background is displayed when received a Blueprint of it from a Weapon pack which is the correct one.