Used to be 5 stars. Then WebExtension completely hamstrung it. You can't install scripts manually anymore, and some scripts stopped working altogether.
Manipuler Java c'est utile mais dans le même temps greasemonkey accède à une quantité de données personnelles illimitées et ça ce n'est pas acceptable.
If you don't know much about how the internet works, please be careful with this add-on! Here is an interesting blog article about how Greasemonkey scripts can be dangerous for you: https://mobilitydigest.com/dont-use-greasemonkey-scripts/