Open source extension that removes comments/recommendations from Youtube: https://github.com/makaroni4/focused_youtube
This is an open-source extension that changes homepage of Youtube (only search bar) and drops recommendations/comments from other pages.
Extension requires access to Youtube website to change its outlook.
Extension icon opens a popup with an option to show/hide the comments section of a video (to check timestamps in comments, for example).
Important: the extension doesn't collect any data about Youtube usage.