The add-on is currently not working in Firefox but the Tampermonkey userscript is working great, I just wanted to say thank you very much. I know the dev submitted a fix and is waiting on Mozilla to approve it, hopefully it's fixed soon.

This extension is great obviously when you use this on mobile it only works on website

Дмитрий, спасибо вам за чудесное расширение. Скажите есть ли новости почему firefox не добавляет новую версию?

Keep doing good work. Hope firefox approves the update soon

Уважаемый Дмитрий, огромное Вам спасибо за всё

The dislike button's icon stopped showing a short while ago
Edit: Changed back to 5 stars based on dev response

Installing this, ironically, FIXED youtube for me. It was starting not to work properly, stalled out constantly seconds into videos, the whole tab freezing the whole browser, and now it's completely fixed and all I had to do was install this. Wacky!