Video favorites - это также как закладки для сайтов в браузере, но только для видео. Копируйте, удаляйте, перемещайте.
Youtube Favorites - an extension that allows you to work with links to videos, channels, playlists in youtube, as well as you work in your operating system with files - copy, delete, move, create folders.
Now you do not have to look for the video you need in the history or in the "watch later." Open videos in pop-up windows (as many as you want). Also you can create bookmarks for timestamps in a video clip, which will allow you to jump to the right moment in one click.