К сожалению, дополнение пришлось отключить. Загрузка папок занимала добрых секунд 20, плюс сам Youtube стал очень медленно работать. Но идея, как и исполнение - выше похвал. Надеюсь у других дополнение работает хорошо и это частный случай

It doesn't work on firefox. Console spams "Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
updatePopupStats moz-extension://76eca0c8-522f-405e-81d8-feae8afbc3c4/lib/ui-service.js:231
ui-service.js:231:25"

It seems google abandoned meaningful improvements to the website years ago. Thanks for doing their job with subscriptions. Do the same with playlists (even just a-z sort, separate personal and subscribed) and the world's most popular media platform would have a decent experience.

Great add on and together with the android App relay good to get my YT subscriptions in order.
would like to give 7 Stars

BEST

Perfect!

I know how this extension is supposed to work because it works just great in Chrome, but I simply can't make it work in Firefox. My Youtube subscriptions remain resolutely ungrouped. My support request to the developer unfortuately bore no fruit.

Грузит процессор на 30 %, после отключения все норм.

used to work but now it doesn't even show up on my you tube i installed a older version specifically 8.014 that version seems to work but none of the newer ones work
it has three Warnings listed

Reading manifest: Warning processing options_page: An unexpected property was found in the WebExtension manifest.
Warning details

Reading manifest: Warning processing oauth2: An unexpected property was found in the WebExtension manifest.
Warning details

Reading manifest: Warning processing key: An unexpected property was found in the WebExtension manifest.

the console also shows this error
Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.

extension no longer works

Are the subscriptions groups stored locally or synced with my firefox account?

Great Addon !