I am an author of many userscripts, and I personally tell my script users to switch from GreasyMonkey when they have problem using my script. The reason is GM i

I am an author of many userscripts, and I personally tell my script users to switch from GreasyMonkey when they have problem using my script. The reason is GM inject the script a little bit differently since GM 4 was released, which breaks some hooking techniques so script will break. As for myself, I use ViolentMonkey because it is more reliable (compared to GM) and open source.