From the publisher's website:

In Firefly: The Game, players captain their own Firefly-class transport ship, traveling the ‘Verse with a handpicked crew of fighters, mechanics and other travelers. As a captain desperate for work, players are compelled to take on any job – so long as it pays. Double-dealing employers, heavy-handed Alliance patrols and marauding Reavers are all in a day’s work for a ship’s captain at the edge of the ‘Verse.