FoxScroller automatically scrolls down to the bottom of some pages, but it doesn't toggle back up. if the direction is reversed it goes to the top of the page and toggles down, but it doesn't go back up when it reaches the end. The version of Firefox is 63.0.3

Use Case:
I'm using auto rotate to rotate through tabs and I'd like the tabs to scroll up and down infinitely.

UPDATE! I found that if i set the zoom level to 0 it works as intended, but as soon as i zoom in to the desired level: 240% or so (large tv) it stops toggling back up. In fact, it stops toggling between 200% and 210%. 5 stars if you fix that!