Greasy Fork is available in English.
Adds features to YouTube player page: fill window with video, stretch, float video, set HD 4K 8K resolution, hide annotations and ads, click skip ads, click show more, loop, replay a video segment, pause at start/end, zoom and pan video.
< Feedback on YouTube Player Controls
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Needed something that can auto-pause video, and this script seems to get the job done with no weird kinks. Recommended.