This add-on track your IP by redirect you to napstr.org with;
google-analytics.com
z.moatads.com - Is a bogus website, used by hackers to redirect traffic to sponsor links or sponsor ads or to promote FAKE Remote Support Services. It generates pop-ups, ads and banners via a malicious browser extension (browser add-on), which is a part of an adware.

But main content mp3 320 kbs (by default) you download from ytapivmp3.com.

Not work!!!!!!!!!!!!!!!!!!

Funktioniert wunderbar, wäre schön wenn ich auch die Möglichkeit hätte auf 128kbps Download! :)

VERY GOOD! THANK YOU!
MUITO BOM! OBRIGADO!
GRACIAS

Foi o único que funcionou para mim.

Работает. Мне понравилось. Удобною Рекомендую.

used to work well, no longer works.

UPDATE October 20, 2022
Add-on no longer works. Only attempts to redirect to a site that I cannot reach. according to some looking around, this is a site to avoid at all costs. I think I'm done returning to this add-on again and again. Do not use. I am also going to report the add-on.

UPDATE Oct 10-22:
You *MUST* use a strict pop up blocker add on and deny the page from opening any pop up windows. When clicking the "Download MP3" button, you will get a pop up. Also the first click after refreshing the page, and every other click with a gap of 10 seconds anywhere on the page. These pages will be everything from "adult content" pages to fishy/phishy add-on advertisements.
Not every click on the green button will work to start the download either. You may need to refresh the page.

Update: Is working again. Simply click the "MP3" button next to the view count on the video, click your desired bitrate on the next window, and done!

Hasn't worked for a little while now. Downloads a 0KB file. Last checked: 08-24-21, 10P GMT

It use to work really well but I wasn't using it for about 2 weeks, now it doesn't work at all...strange. I really hope this company repair the glitch.

Work! - using "napstr.org" site.
Thanx!

Not found

Fast & easy!!! Thanks.

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Excelente sin pretextos, cumple lo que dice.