This is what I've been looking for.

The initial setup process was a bit of a hassle, but the rating bar saves so much time it was worth it.

Perfect extension.

This little extension does exactly what I want, no more no less. It simply displays the like/dislike ratio over the thumbnails so you an quickly determine what's not worth watching.
The whole API obtaining process is a bit of a hassle but worth it over the public API since the private one is almost instantaneous compared to ~5 sec for the public one.
Thanks for a nice extension!

Tienes que seguir los pasos a pie de la letra, pero de que funciona, funciona

FANTABULOUS!
I was hesitant to install this, but the tutorial is so detailed I managed to do it in one go. And it works like a charm, after a couple of months of heavy daily usage.
Thanks a lot!

Merci ça fonctionne !

Works fine with the bars appearing almost instantly. You do have to follow the instructions and jump through all those hoops needed to get a Youtube API key though, otherwise if you use the public "Invidious" key instead then only some of the thumbnails get the bar and only after waiting several seconds.

Pity this addon doesn't use that API key to add a tag to the thumbnails to tell you if they're available in HD or not, because that's the other thing that tells you if the videos are worth watching or not.

Excellent extension that works perfectly. Has clear steps for setting it up with the API key. Thanks for making this and keeping it open source :)

I have used this add-on for a long time. Thus works very good, outside the occasional YouTube change that break this add-on.