YTBookmarker от OneShotDev

The Add-on saves the link of a YouTube video (at its current playback position) into a sub-folder in your bookmark bar that has the name of the video uploader (YouTube channel). These sub-folders are created in the folder "YTBookmarker Videos" (by default / can be renamed) in your bookmark bar.
- Contains "Let's Play Mode" especially for the bookmarking of Let's Play videos or videos that belong to a series. It allows delimiters at which the bookmark name is cutted (e.g. "Let's Play Minecraft #012" can turn into "Minecraft")
- Name of folders and subfolders can be edited in the preferences of the Add-on where also the "Let's Play Mode" can be turned on/off.