Well it certainly seen combat in WW2, although extremely limited - the Fairey Fulmar was more common then the Firefly was.
It started on the HMS Indefatigable, and was involved on the Attack on the german battleship Tirpitz. On Jan 45 it flew ground strikes on the oil refineries in Sumatra, even shot down a Ki.43, few days later 5 more japanese fighters were shot down. It was on a raid that sank a japanese carrier, so it certainly had its share of action in Okinawa.
It certainly served in combat, however only two squadrons the 1770 and 1772 (that I read) have seen combat. Enough to be added to aces high,
but I am curious what the perk value would be for it.
Might be 20-30 perks, while Fulmar would high ENY (30-40)