Firmino's strike catapulted the Merseysiders 16 points clear of Manchester City who have played one game more than Liverpool.
"You just have to find a way to win and have someone who makes the perfect decision and that was Bobby again," said Klopp. "A worldie I would say from Bobby, a super goal."
Liverpool have won 22 and drawn one of their 23 Premier League fixtures this season.
Absence
However they could be without star striker Sadio Mané for the next game against West Ham United on 29 January. The 27-year-old limped off with a hamstring injury in the first half.
Defeat leaves Wolves in seventh, six points off fourth place which leads to next season's Uefa Champions League.
"It was a fantastic game of football," said Wolves boss Nuno Espirito Santo. "We have to keep going and keep getting stronger."
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