Excellent functionality.
Just what I was looking for. I have literally 1000's of subs which was impossible to manage. Thank you my dude.

A bit slow
Update: Hi, you were right. I was investigating in a private tab. An extension called "600% Sound Volume" was really messing with my Youtube subscriptions page with this extension on. While looking through their extension reviews, I also found that their extension apparently injects code or something. Anyways, yeah, I removed the extension, and everything is fine now. I increased the rating to 5 stars, as it does everything I need it to. Thanks

only if it was available on android :(

Seеms that pockettube banned all users with russian language in operating system. developers need to now, that russian language is internetional language for many countries, like Kazakhstan, Armenia, Azerbaijan, Tajikistan, Turkmenia, Kyrgyzstan, even for Georfia, and Ukraine. So banning russian language, you banned a lot of users, that never was related to Russia-Ukraine relationship. If someone says that war in the Ukraine more important than anything, i will say when war was in my country, world went on, and no one did not condemn the agression against my people. Ukraine not special.
Upd. Last usable version for me is 11.0.11. Any above version just dont work. Im not from Russia or Ukraine. And understand your position. But something looks broken.
Upd 2. Thanks, changing country from Russia helps. Unfortunately youtube has no Armenia in country choice, so i was using Russia.

I like the recent update. Though there is a bug at the Subscriptions page that appeared after that. If, say, I filtered out one group before I finished my previous session of browser. In the current session, I made some changes to the filtering (e.g., include that group back in). The changes would be applied normally at first glance, but when I scroll down the subscription videos list far enough such that the loading icon appears, after the loading finish the filtered results would be reverted back to the previous state (i.e., before I made the changes), and I have to change the filters again for it to work normally again. This would happen once for every session of the browser (i.e., if I restart Firefox this would occur again). I think this has something to do with how the filtering option is cache.

There was a ton of channels that I visited frequently but didn't subscribe to in order to not turn my subs list into a cluttered mess. This extension brought order and allowed me to categorize subs into convenient groups! Recommend!

Super fast Bug fixing, fantastic extension. I can't live without it anymore. Thanks a lot! 🤩

After a recent update can no longer click on the topmost subscription groups. There are now for some reason three white distracting circles on top (background), which not only distract, but also makes clicking on the topmost subscription groups brings the sorting menu instead of opening them... Not sure the circles are done by you or Youtube, anyway only way to fix is to hide the circles using ublock picker.

Edit: thanks.

This is a very handy extension for grouping subscriptions by category. I really like it. It did have a problem for about one day last week, in which Firefox froze. But I think that was a temporary bug. If I continue to like this add-on, I will send a PayPal or cup-of-coffee donation or something. It is very convenient.

Firefox 91.7.1 / iMac
GREAT extension, I have a ton of subscriptions and this add-on allows me to quickly see new uploads organized into groups of my own creation...without have to scroll through dozens of channels individually. Bonus: the channel display of groups in YouTube Subscription manager defaults to their "uploads/video" list. Otherwise I often have to click that link on a subscribed to channel to bypass their intro videos/shorts/playlists or w/e. Good stuff!
The only "glitch" that doesn't even bother me is often having to re-load the Youtube main page to get YTSM to display new video counts next to my groups...like it needs to read the home page after it loads up or something...otherwise it's 100 percent.