Adds clickable thumbnail
< Feedback on youtube.com - thumbnail
would be good if you could provide info on how to reproduce this.
open webpage with embedded youtube video
if script enabled - you see as background image loaded and hided under this video, and if script disabled - background image turn back
so script hide basckground image in it
if script enabled - you see as background image loaded and hided under this >video, and if script disabled - background image turn back
I don't see this behavior in chrome, but I've restricted script execution within frames just in case.
good, it work
it hide background-images in embedded yt videos
it hide background-images in embedded youtube videos: