Adding bookmark solution:  javascript:(function(){  var nsfw_url = window.location.href ;var isyt = nsfw_url.indexOf("youtube.com");if (isyt != -1 && nsfw_url.indexOf("nsfwyoutube.com") == -1){ var final = nsfw_url.replace("youtube.com", "nsfwyoutube.com"); window.location = final; }   else {alert ("You have to be on youtube.com for this to work!");}   })();  -Make a bookmark - add this code in "location" / "url", and simply click it when an age-restricted video pops up. The link for this is also available in the nsfwyoutube.com sidebar.