On 25 November 2007, Firmani scored his first goal for the "Biancocelesti" against Parma F.C. at the "Stadio Olimpico", in a 1–0 victory. The goal, which was scored in the 90th minute, came only a week after the death of his good friend Gabriele Sandri, who was shot by a policeman, and the player's celebration with fans in "Curva Nord" earnt him their recognition; due to injuries, he only managed seven appearances for the season but still netted three times, the other two being successful strikes against U.S. Città di Palermo and S.S.C. Napoli.