First of all, why do you need to fire employees to run a startup ? I don't think this is a major need in the development of a startup in fact firing someone is

First of all, why do you need to fire employees to run a startup ? I don't think this is a major need in the development of a startup in fact firing someone is dangerous since you lose experience and knowledge. France as many countries in Europe have laws that protect employees against abuse from companies but you can still fire someone if there is a reason it is just regulated.