Parachutes would be worst than useless. Having them on would make it harder to work, and easier to lose their balance. Then when they do fall, they would be a panic, and forget to open the parachute. And if they did open it, it would take too long to open. You can fall a fatal distance, about 30 meters, in just 2 or 3 seconds.
The minimum distance for a parachute to open, without major injury, is 120 meters. And even that is with idea conditions.