The Brazil international has scored 26 goals in all competitions for Jurgen Klopp's side this term, including 10 in the Champions League.
Despite the 2017-18 season being his most prolific at Anfield since arriving from Hoffenheim in 2015, Firmino believes that there is still room for improvement.
"This year is my best year as a professional footballer... but I am still a little bit restless as I always want more, to grow and grow even further," the 26-year-old told UEFA.com.
"[It would be] a unique moment to win the final. It's a very special trophy because it's the Champions League. If we're fortunate enough to be able to win it, it will be a very emotional moment for me and the whole team."