scroll up and down buttons

Add up/down navigation buttons with a settings panel (timer & transparency).

this is a very helpful userscript that allows you to scroll to the top and bottom of a web page.

Marjanoo edition - where you have the option to make the button transparent (so that the buttons won't get in the way):
https://gf.qytechs.cn/en/scripts/546045-scroll-up-and-down-buttons?version=1664766

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