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.

Works fine with the new api fix things but it is still annoying that it places itself at the bottom of the thumbnail and moves the playback red bar to the top instead of just placing itself at the top.
Wish there was a setting to reverse them...

Ok, it works now.

Hi, I've been thinking for a long time now that it would be really nice of there was an option to also show like-to-view ratio (as percentage), or even dislike-to-view ratio. It's surprisingly important and in many cases better metric to measure video success. You could display it in the same info box with the the like ratio when you hover mouse over the like-dislike bar.