Scroller Bookmarklet

Add a compact floating autoscroller to any page, then tune speed and direction live.

Drag this button to your bookmarks bar:

Loading bookmarklet...

Usage

Open any page, then click the Scroller bookmarklet.
Hover the circular control in the bottom-left corner to expand it.
Use play or pause, adjust the speed slider, or flip the arrow to reverse direction instantly.
Close the widget to remove the entire UI and stop the animation loop.

Launch the same widget here if you want to inspect the controls before installing the bookmarklet.