A revamp of the YouTube Collections feature, in a Chrome Extension.
YouTube had an awesome feature before called YouTube Collections. It allowed you to group your subscriptions together into a “collection”, which let you browse similar types of channels together. For example, if you had a lot of music-related subscriptions, you could add them into a “Music” collection and watch all music-related channel uploads together. The same could be done with entertainment channels, cooking channels, etc.
Sadly, YouTube decided to remove this feature as not many users were using it. This Chrome extension is a revamp of YouTube collections, but implemented in a Chrome Extension.
A tutorial on how to use the app can be found here: