Philippe Coutinho and Mohamed Salah fired Liverpool into a 2-0 lead at the Emirates Stadium, only for Alexis Sanchez, Granit Xhaka and Mesut Ozil all to strike in five minutes and blast Arsenal into an unlikely lead.
"Sadio Mane didn't play here but he will score if we play like this, if we bring the different players in the different moments in the different situations".
Firmino got in on the act again with 25 minutes remaining, rolling the ball into an open net from Salah's lay-off.
Just six minutes into this game, Coutinho was strutting his stuff aided by the team-mates who have also had their share of the limelight this season thanks to their combination of flair and hard work.
The No. 10 took a touch and immediately bent an unstoppable shot into the far top corner to give the Reds the lead. Oxlade-Chamberlain added a fifth four good measure, his fairly muted celebration in front of the Kop demonstrating how routine and unexpected the goalscoring had become.
More Liverpool meet Swansea in a classic Boxing Day battle, with the league's lowest scorers travelling to face one of the most feared attacking teams in the Premier League. I could have done better with my end product a few times.
There's a lot to love about Roberto Firmino.
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Other performers already announced for the live Times Square performances include Camila Cabello, Nick Jonas and Sugarland. Following the show, Carey posted a meme of herself on social media with the message "s-- happens".
Swansea, meanwhile, are now in all sorts of trouble, and even though any manager, whether it be caretaker boss Leon Britton or a new higher profile appointment, would have struggled here against Liverpool, their club needs more stability as they look to retain their Premier League status.
The Estonia global lamented Jurgen Klopp's side leaking three goals in five minutes at Arsenal, as Liverpool slipped to a 3-3 draw at the Emirates Stadium on Friday night.
Salah then launched onto a lobbed ball from Andrew Robertson but Fabianski was out quickly to deny the Egyptian his 16th league goal this campaign.
"Look at Joe Gomez", Klopp added.
Only a minute later and Firmino was back in the goals, Swansea collapsed as Salah was able to claim his second assist of the night and tee up his strike partner.
Swansea claimed a shock 3-2 victory in their last visit to Anfield, thanks to goals from Fernando Llorente (2) and Gylfi Sirgudsson, and Britton is hoping a repeat result can inspire the club in their fight against relegation.