This is not entirely wrong, but is misleading. Yes, striking is supposed to be a protected worker right, but there are entire regulations to follow for that ("préavis" / "droit de retrait" etc). However, it was not always the case and for most of french history striking was illegal and heavily repressed. It's important to note, because in the past decade or so there's been massive retaliation against some organized workers in certain corporations and even in public services like La Poste. Striking is only protected as long as the balance of power shifts in our direction, and it's fair to say that the bourgeoisie has been gaining momentum while we have lost significant rights since Sarkozy, and our protests have been heavily repressed including maiming and murders by cops.

As for demonstrations, what you said is incorrect. There is no obligation for the prefecture to approve your request before you go on a demo. There is indeed an obligation to declare it but unless it's explicitly forbidden you are go. It used to be, not so long ago that undeclared demos were legal and i believe it was only under nazi occupation that they weren't. Sarkozy changed that to repress young people hanging out in public spaces by making 3 people or more hanging out together illegal.

It's important to understand that outlawing demonstrations in France (along with other obvious signs of growing fascism) are a rather recent phenomenon. Except for workers/ecologist or pro-Gaza demonstrations repressed in the past decade, the last forbidden demonstrations in France date from the 60s (in support of Algerian independence).

Still, they'll never stop our "manif sauvage" :)