There were excellent individual performances everywhere you looked, but the team as a whole looked back to its devastating best.
Firmino’s close-range finish gave Liverpool an early lead, with the Brazilian finishing well after typically industrious work by Mane.
Mane was the Reds’ standout player on a great night at Anfield, with the flying forward bordering on unplayable with his pace, trickery and ruthless end product.
With nerves jangling after Danny Welbeck pulled a goal back, a delightful sweeping move was finished off by the excellent Wijnaldum. He has now scored at home to Arsenal, Chelsea and Man City this season.
Jurgen Klopp sped down the touchline when Wijnaldum scored, celebrating with an equally overjoyed supporter in the process.
The scenes were understandably jubilant at the final whistle, with Klopp embracing with his players and lapping up the applause.
Attention now turns to next Sunday’s visit of Burnley, with a similar level of performance required.