Literally the best restaurant in Vegas- and that's saying something!
Definitely try the sangria (especially during the happy hour specials). Anything you order of the menu is going to be amazing- I've seriously yet to be disappointed.
Protip: If you ever got the horrible "reality" show Gigolos on Showtime, the guys are always eating at Firefly. So, you know, eat where your favorite man whores go ;)