Since Scratch 3.0 removed the X and Y position of the mouse under the stage and I thought it's an useful feature, I recreated it with a simple script. To activate/deactivate it, click it. You can drag the button and the variable inside the editor. You can put the sprite in your backpack and use it for creating your own projects. You don't need to give credit, just leave the note inside the sprite. I'm not sure if this going to be useful for anyone else than me, lol.