I am getting the exact same thing. Started happening today out of absolutely NOWHERE. Literally was going through a playlist and in a matter of a few videos, these errors started coming up. Scanned my computer with MalwareBytes and SUPERAntiSpyware and both popped up with nothing. Really annoying, especially because it decides to speak out saying "Threat has been detected!" Why does it have to make noise like that? Also for when it updates, rahhh!
Either way, please fix this because I highly doubt I did something to make this happen. Maybe it's a commono extension extension like Adblock Plus or something that's causing it?
Regards
URL hxxp://yt.extensionstats.com/v?ms=1&id=L7Oll5dpM2c&op=1&eid=kekkiaca&url=https%3A//www.youtube.com/watch%3Fv%3D
Infection URL:Mal
EDIT:
Weird.. I just disabled all of my extensions and then it stopped. Re-enabled them all, it pops up.. I wonder which one is problematic... Ugh...
DOUBLE EDIT:
FOUND IT! It appears to be ----- "Open SEO Stats(Formerly: PageRank Status)", one of my favorite extensions
(I assume you both also have this extension installed?) wonder if it's a false-positive or if they are actually doing something fishy...