Firmino scored in the 37th minute, shooting from close range, and Liverpool closed the half in total control.
The spurs, without the injured attacker of talismans Harry Kane, were much more lively after the break as Liverpool’s pace slowed down.
Son Heung-min wasted a great opportunity to equalize after Liverpool was taken in possession and therefore the substitute Giovani Lo Celso somehow missed the goal with the goal wide open while Tottenham threw the men forward.
They couldn’t find the equalizer and Jose Mourinho’s team slipped to eighth place in the standings with 30 points in 22 games after winning only one of the last five league games.
Leicester lost more ground as he was surprisingly beaten 2-1 at home by Southampton, while Manchester United rose to fifth place with a 4-0 win on the underside of Norwich.
In Leicester, Danny Ings scored the winner nine minutes from time to lift Southampton out of trouble and leave the hosts in second place.
After Stuart Armstrong put Southampton ahead, Dennis Praet draws and Ings wins it for visitors, although Leicester has ruled out a second draw from VAR for offside.
Marcus Rashford scored twice while Manchester United rose to fifth with a 4-0 win on the underside of Norwich.
Anthony Martial and Mason Greenwood achieved the other goals while United produced a fluent display.
Chelsea beat Burnley 3-0 to cement fourth place while Richarlison gave Everton a 1-0 win over Brighton.
Pierre-Emerick Aubameyang was the hero and villain while Arsenal drew 1-1 at Crystal Palace in the lunchtime kick-off.
Aubameyang scored Arsenal’s goal but was sent off in the second half when the Palace recovered one point and stopped one point ahead of London’s rivals in ninth place.
The Gabon forward gave Arsenal the perfect start with a 12-minute goal, but Jordan Ayew drew nine minutes in the second half.
Aubameyang was sent off for a foul on Max Meyer in the 67th minute, boosted by a yellow card from VAR, but Arsenal almost won late when Nicolas Pepe hit the crossbar.
The wolves drew 1-1 with Newcastle in the other game of the day.
Liverpool’s record compared to other European leagues
- England: Liverpool (2019-20) M-21 W-20 D-1 L-0 P-61
- Spain: Barcelona (2010-11) M-21 W-19 D-1 L-1 P-58
- Italy: Juventus (2018-19) M-21 W-19 D-2 L-0 P-59
- Germany: Bayern Munich (2013-14) M-21 W-19 D-2 L-0 P-59
- France: Paris St Germain (2018-19) M-21 W-19 D-2 L-0 P-59
Reuters with AAP