This is essential when watching videos. I can't imagine YouTube without this.

Musthave

Works excellent. Only complaint is that there should be a way to report false positives that the script catches.

Very good addon that can enhance the Youtube experience. Only small downside is there is a leaderboard for submitters which I found out leads to people rushing to extremely popular channels and the second a video is released quickly spam segmets everywhere, often halfassed which leads to awkward cuts and overreporting of segments. If the incentive for doing this is removed it will become even better.