Works well on youtube but on any other site with youtube videos the browser shows in the status bar endless calls to youtube and the tampermonkey's icon flashes each time. Is there a way to stop that?

Small fix - adding this function

function isEmbedded(){
return document.URL.match(/\/embed\//i) !== null;
}

and then modyfing

window.addEventListener('locationchange', function(){
if(!cookieIsSet())

to

window.addEventListener('locationchange', function(){
if(!cookieIsSet() && !isEmbedded)

should fix the problem of embedded videos being refreshed constantly as the script is in fact unable to set the cookie and thus such endless loop occurs.

function isEmbedded(){
return document.URL.match(/\/embed\//i) !== null;
}

Thanks!!!