Not open-source, some features are locked behind paywall. Sad to see this is the only extension that has channel grouping.
I understand making extension like this costs money but at least you could make donation optional rather than locking some of features behind a paywall.
Other than that, I am using the base feature very well. However please keep this review in mind and won't change this review unless the above problem gets resolved.
The base features аre free. Watch the full tutorial: https://www.youtube.com/watch?v=r4iX53Qg2sE If you need more, become my supporter. It takes time to update the extension every time YouTube changes internally.
