Wow! $9.99 all you can eat BBQ brunch on Sundays. I have to say, I was more than impressed. The buffet more than exceeded my expectations. It was better than the standard menu offerings of many BBQ joints.
Firefly's offered a sizable buffet, featuring brisket, chicken, pulled pork, and pork ribs (sans bones, blasphempous, but delicious). Also there was salad, mac and cheese, cucumber salad, potato salad, cole slaw, corn bread, biscuits, and more--although I mainly focused on meat. They also had a rack of around fifty hot sauces, with a list describing them and specifying the scoville rating for each (how hot they are).
After your meal, head down to Ocean State Job Lot, about a half a mile west on route 20-- they have a tremendous selection of condiments and food supplies at ridiculously low prices.