Check whether it's worth watching a video before actually clicking on it by peeking it's visual or verbal content, description, comments, viewing the thumbnail in full-size and displaying the full title. Works on both YouTube's desktop and mobile layouts, and is also compatible with dark theme.
< Feedback op YouTube Clickbait-Buster
In Firefox it's still working fine, while in Chrome it stopped working completely. It seems in Chrome YouTube has a different layout. Did your YouTube changed layout recently? Or did you installed any other script/extension that changes the layout in any way?
It's back to working properly. I guess the issue was that youtube was serving me a new experimental UI for my sidebar. It's gone back to the old sidebar, for now.
Works great on the home page, channel page and results page...but it currently doesn't work for videos in the right youtube sidebar (while watching a video).