The main reason I wanted this extension was to make Youtube stop spamming already watched videos, random playlists and useless shorts.
1) It doesn't block already watched videos, it just makes them less visible by hiding the thumbnail and dimming their links;
2) Sometimes it marks random videos as watched, but I never even clicked their links, even less watched them;
3) It cannot block playlists, as far as I used it;
4) It blocks shorts successfully AND entirely (not just dim their links).

Great extension and much lighter than the enhance youtube extension which is also great but slows down the system. I prefer this one

On Android versions Firefox The extension does not work

Bien pour une extension, mais je recommande plutôt d'utiliser des userscripts avec TamperMonkey et assimiliés.

Very slow (even by youtube standards), whatever what the dev will say: sometimes takes almost a minute to load a youtube video, and often will fail to load the full page, with the comments.

Very buggy: again, often failing to load a page fully, the mini-player suddenly not appearing anymore when scrolling down, or among many others, the limiting to H.264 not working reliably (to be fair, it only reliably works with enhanced-h264ify, whichever main youtube extension I use). Even the menu is buggy: the search bar will always cover the link to go back in the menu (so one has to close that search bar again and again), and if used in the extension panel (as opposed to using it pinned), it won't even fit the window properly, lol!

Fortunately, I discovered a little used extension (Tweaks for youtube: only about 3k users, which is baffling), that is great where Improve youtube isn't at all. I tested them all, and that's the only one I'll keep.

amazing, simply put. I wish they had more playlist features though

Best Extension For Youtube ever!

ich kann diese Bewertungen NICHT LESEN. Ich brauche eine Deutsche Sprache! Sonst nützt mir das alles NICHTS !!

The lag is real and not just a myth, please don't just deny it instead try to fix the issue.

My youtube is lag heavily for at least couple months (I even switch to freetube but switch back because it got some problems too).

I tried browser switcher and many things but never solve the problem. Pretty much youtube will lag heavily (pause and move 5 second can take over 5 seconds to respond) after I use it for more than 5-10 minutes.

Today I just remove the extention and the problem solved. I've been using youtube for at least over 3 hours now and there's no lag anymore.

Please don't say any excuse and try to fix the issue.

I usually only open less than 5 tabs on my browser and saying that you guys are just some volunteer is not a reason to not fix your extention.