The only one which worked, but you can just use the website like with most of these, no need to install an addon.

Despite multiple cries and yells about pop-ups and "third-party" THIS ADD-ON WORKS and MAKES JOB WELL ! (-:
Best and most stable among similar !!!

Funktioniert.

i did try many famous downloder but the only one wich works is this one

No addon like it, best ytmp3 addon

Great addon

it works perfect

It downloads things sometimes, but it opens random webpages that I don't even know! Seriously. I'm getting rid of this...

Redirect verso sito pubblicitario, apre pagina di pubblicità.

Дополнение конвертирует видео, как и обещает. Но после каждого нажатия "Start Link Conversation" открываются дополнительные окна с сайтами-лохотронами: "Получите компенсацию блаблабла", "best.aliexpress" и прочим мусором.

very very good, I love it!

UPDATE: Love this addon soo much and works perfectly with high quality rips everytime!
Used to love this by trying all instructions and going to the correct conversion site but does not load or get to conversion page. Only lots of ads and pop-ups that stay blank or I get to small pop-ups that flash really fast in the top Left and bottom right of my screen.
Sad as this was honestly the best and easiest to use!

It adds extra stuff after you load the page/extension. It only pops up once, but very annoying. The extention works perfectly. I highly recommend.