Greasy Fork is available in English.
This script prevents Youtube from autoplaying the next video by switching the autoplay toggle to "off"
< Feedback on Disable Youtube next video autoplay
"up-voting" this request.
I changed the name to what you suggested, "Disable YouTube next up autoplay"
Rename to Disable Youtube Up Next Autoplay
Work like a charm
I think you should change the name to "Disable Youtube Up Next Autoplay" because youtube autoplay can be ambiguous.