This used to be a great open source addon for removing clutter from Youtube (not just recommendations).

However, the developer has recently disabled almost every feature in the addon (except the ability to remove recommendations and disable shorts), requiring you to pay to restore the majority of the functionality. In addition to that, the addon now not only collects data on you, but the author has recently been committing a bunch of LLM generated code to the repository. I would stay away!

If you just care about removing recommendations, this might still be an option for you (although I would recommend uninstalling it). But for decluttering the Youtube UI, you can do what I did and instead use YouTube Redux, another addon, which is still open source and free as in beer. In fact I actually like that one a lot better, because it does an even more complete job of fixing the YouTube UI.

YouTube Redux doesn't actually remove recommendations or disable autoplay, so you'll still have to find other ways to accomplish that if you want to. I actually found the recommendations that YouTube Redux shows to be so unobtrusive that I didn't even look for ways to disable them, and autoplay can be disabled by other means (for example, if you don't want to sign into Youtube, there's a reddit post you can find of a single line you can add to your uBlock Origin filters that blocks the autoplay Javascript, and there are other addons that accomplish the same).

Stop asking me for new permissions and filling up my YouTube feed with your huge red icon. Wtf? Uninstalled. Better addons out there

Core features that were free for years are now locked behind a paywall. It was good while it lasted, I suppose.

many features that were free are now premium

to change once free features to premium ones is really a dick move.
i discovered it just a few days ago and was very happy...

Don't hide most of the features behind a premium you have to pay for.

Do not install, they removed basic features from the addon and locked it behind a paywall. I used this to make youtube less distracting, and now I have to find something else.

PURE GREED!

Taking features that used to be available to everyone and locking them behind a monthly subscription is kind of a scumbag move :/

Doesn't work in waterfox. The YT main page attempts to load an infinite number of videos to fill up the empty space, which is a problem I also ran into when trying to use ublock origin and blocktube to block videos on the main page - YT just replaces the blocked videos with new ones until all the empty spots are filled.
In the case of this add-on & YT's main page, both sides refuse to budge, so the browser gets stuck in a runaway loop of trying to load videos that will never appear, which freezes all tabs in your browser until you take matters into your own hands with task manager.
I'll update this review accordingly if this major issue is fixed in waterfox.

Useless with polymer off.