Some were, some weren't. But none were so helpful as the Poles or the Litvakhs or the Byellorussians or the Slovaks or the Croats or the Romanians or the Cossaks or the Ukrainians.
The French are scum. They were the most productive of any German-occupied countries.
France had by far biggest economy of any country conquered by Germany. Thousands of French were put in slave labor too.