Damian Penaud scored a hat-trick of tries as their World Cup adventure gathered speed on Thursday.
France hit the ground running when Penaud caught an Antoine Dupont kick to score after seven minutes.
They did not let up as Jonathan Danty grabbed the second and Charles Ollivon the third after a brilliant handling move down the right wing.
Penaud and Danty each got their second before Thibaud Flament, Dupont and Louis Bielle-Biarrey made it eight in the first half for a 54-0 lead.
Divan Rossouw crossed the line for Namibia with an interception early in the second half but it was ruled out for a high hit on Dupont, which earned Johan Deysel a red card and forced the France captain off the field worryingly holding his jaw.
Against 14 tiring men for 35 minutes, France scored further tries through Baptiste Couilloud, Penaud's hat-trick, Bielle-Biarrey and Ollivon's second, Melvyn Jaminet and a penalty try.
And with Thomas Ramos landing 12 of his 13 conversions, they overhauled their previous record win - also against Namibia - which was 87-10 in the 2007 World Cup in Toulouse.
France top the pool on 13 points after three wins but are yet to guarantee a quarter-final slot as New Zealand and Italy, who they face in their final fixture in two weeks, are still in contention.
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