https://forums.opera.com/topic/29917/can-gallery-pro69-viwindow-mp4-and-similar-pop-ups-be-stopped/2?lang=en-US
Can gallery.pro69.viwindow.mp4 and similar pop-ups be stopped? | Opera forums
Dec 5, 2018 - An MP4 file is a video, so apparently the site is trying to autoplay a video.