I just recently switched from chrome to Firefox and it's been great, but its really bugging me that when i middle click so i can scroll the page by just moving my mouse the cursor is still on screen. Is there anyway to get rid of the cursor only when I'm in that middle click scroll mode?

The first image is what it's currently like, and the second i what I'm trying to get. I just don't want the cursor flying all over the screen when I'm trying to read something. I would really appreciate any help, Thanks!