Gogoanime is indeed safe. These would be ads that would pop up if you accidentally clicked it, as to their main purpose is to advertise. Sometimes it pops up when you right click unconsciously. They usually don’t contain viruses. However, this is not 100%. Try www.gogoanime.com instead it is the best site and there absolutely no ads to wait for. The streaming of these animes are from youtube. —–>Trust me on this one. I am a anime freak.