Firebird takes Battlefield 2 and adds a balance of arcade and realism to the gameplay with lots of new vehicles, weapons, and over 100 individual maps to choose from. Multiplayer, co-op, and Singleplayer are available on all levels.
This is the levels folder, put it in Battlefield 2/mods/FIREBIRD after you extract it
single player error
Try removing 2.2 from the end of the firebird 2.2 folder name so it just says Firebird. Some users are having this problem