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.