Liverpool fans on social media believe Firmino's performance against the Manchester club was one of his best in a red shirt.
The Brazilian restored Liverpool's lead in the second half, chipping goalkeeper Ederson to make it 2-1.
Firmino has 18 goals and 8 assists in all competitions this season, second only to new signing Mohamed Salah.
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Roberto Firmino is no longer part of the system, he is the system.
— Dharma Bhagalia (@Kloppholic) January 15, 2018
Sensational stuff by a sensational footballer. Roberto Firmino is having the best season ever in his professional career.
— Seleção Brasileira (@BrazilStat) January 14, 2018
Forget Coutinho. Fimino is the Brazilian we cannot live without. He's literally the system. Without him we wouldn't be nearly as good. Work rate, creativity, link-up play and goals. The complete striker. pic.twitter.com/sslzO2iziN
— LFC News (@LFCTransferNRS) January 14, 2018