Hi, I've noticed the positioning of elements when tied to scroll is very choppy in the new Quantum Firefox. I didn't notice this in the old Firefox. https://aspirestar.com/music/index.html The above website uses scroll based positioning to create a parallax effect. Up until the old Firefox, the scroll was smooth. After the upgrade to Quantum the elements which gets positioned on scroll is very choppy. This was not the case in the old Firefox as well as current chrome and every other browser. Also when you scroll using a trackpad or using the scroll bar there is no choppiness. Only when using the scroll wheel on the mouse this issue occurs. Now here is the weird thing which further hints this is a firefox issue. When you open the "Developer Tools" and scroll, the choppiness disappears. When you close the developer tools and scroll, the choppiness returns. Could Firefox look into this issue soon. Thanks, Codey