Sorry Dmitry this add on is only partially working on latest Firefox 64 bit version for Youtube. It works on the short videos.
In the comments and replies it is not working at all. Also on the main video title Like/Dislike it still only shows the likes. Interestingly now it also shows "Disabled by Owner" which I never saw before the add-on. Hopefully you can resolve it.

Update: The Dislikes are now visible on the Main YT videos - Thanks.

Is there any way to see the Dislikes in the Comments section of the Video ?

Sometimes a little glitchy with the new updated ui, but works pretty well.

A few times its inaccurate or glitchy.

22.05.23 👎temporarily unavailable🤷‍♂️Mozilla Firefox Problems again😫

Occasionally it stops working but that's YouTube's fault. I had a very old channel with only a few videos, most of which having only like 20 views, and it got the dislike count perfectly! I had to sign in to that old account just to make sure! The only thing holding it back from 5 stars is the fact that it can remain broken for a few days before an update fixes it. Also it doesn't work on the mobile interface or TV interface, but those are only slight things.

На 13.05.23 последняя версия работает, но, по-моему, считает неверно - только общую картину соотношения даёт.

понял. ждем.
но у конкурента уже обновлено было еще когда писал вам отзыв ). чето вы долго

Overall it's good but recently the plug has stopped working on desktop, although it still is working in my tablet with the pc mode switched on.

Waiting for the plugin update, I thought you were blocked or reported by youtube pro companies but glad to come back

after 10 reinstalls, still showing 3.0.0.8, wont install new version

Back to normal on Brave, and I am still waiting for my main browser Firefox.

Todo estaba bien hasta el día de hoy, pero ahora parece no funcionar, si pudieran arreglar eso se los agradecería mucho

This was the best extension ever!

Too bad that it seems will no longer work because YouTube hide the dislike info in their core API.

Now we will never know if a tutorial is good or bad. Time to stop trusting YouTube.

It worked perfectly fine for a long time but for the past few days it's been broken on Firefox. Please fix soon. <3

Now on April 9, 2023 it is no longer working!

NOOO IT DOESN'T WORK ANYMORE! PLEASE FIX IT!

Used it for a minute or so, it looks like it changed the font a little. Not the most useful thing ever, but it's nice to have