Firmino's only other goal came in the Merseyside club's 4-1 thumping of Manchester City in November, when he was also named man of the match.
Liverpool, who are ninth in the table, host bitter rivals Manchester United, in sixth, in the league on Sunday.
"I hope I can play like that against all teams, not only the big teams," Firmino told the club's website (www.liverpoolfc.com).
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"Manchester United are a big team and I know how big this derby is here... If we do as well as we did up front (against Arsenal) against them, we have a good chance to win on Sunday."
(Reporting by Shravanth Vijayakumar in Bengaluru; editing by John Stonestreet)
