Firefly is a Cobra operative in the original G.I. Joe: A Real American Hero line. First released as a Hasbro carded action figure in 1984, with 3 distinct figure versions produced across the 1982 to 1994 ARAH run.
Firefly appears in 1 episode synopsis across the Sunbow (1983 to 1987) and DiC (1989 to 1992) runs, first appearing in Sunbow's "The Revenge of Cobra, Part 3: The Palace of Doom" (1984). Full screencap and continuity review pending.