The Brazil international ended his eight-month wait for a Premier League goal at Anfield in the most emphatic fashion on Saturday evening.
Firmino scored twice in 90 seconds after Ainsley Maitland-Niles put the Gunners ahead and later – following strikes by Sadio Mane and Mohamed Salah – added his third and the Reds’ fifth in the second half.
“It was fully deserved. He had a very good game,” Shaqiri told Liverpoolfc.com post-match.
“It’s always good to have people who can score in the team, he scored the second one very nicely. He fully deserved to score a hat-trick and I’m happy for him.