A chrome extension what one-click scroll to the top of the page, for some SX pages that don't have a top button. If you don't know CMD +(top/down).

use window.requestAnimationFrame or setTimeout.

window.requestAnimationFrame ? window.requestAnimationFrame(func) : setTimeout(func, 16)

• https://github.com/ra-utility/scrolltop--extension/releases/tag/1.0

If you want to publish the plugin to the Google app market, you need money, so here you need to download the CTX file, unzip it and use it.