It used to work, but when I first downloaded it there was a message about how youtube was going to completely remove the bits that were previously just hidden which this addon relied on. Anyway, looks like those bits have now been fully removed.

Parou de funcionar

Doesn't work

Stopped working.

Really great add-on, but it no longer works

No funciona

Looks like the addon does not work in Firefox 118.0.2 under Linux :-(

LISTEN HERE GUYS: while this add-on does not work anymore (for now), consider visiting the official website and installing either the latest version OR using the userscript!

Till it is back working users can try addon Thumbnail Rating Bar for YouTube
it shows you likes and dislikes before even clicking on a video.

Everyone, the add-on is not working right now, but the fixed version is created - it just needs to pass Mozilla's review to be authorized. Give it some time.

Was great when working but youtube has done something to stop it working, sad face.
Now working again, smile face. Now not working, again

extension no longer works unfortunately

Don't working....