It seems to be a new thing, but often now an embedded video will shift into a stand alone box when you scroll passed the embedded part and it opens in a new box in the bottom corner of the browser window. It then auto starts. I know that there is a setting to stop embedded video from auto playing but is there a way or an addon which will stop this behavior. For example the video in this story http://www.dailymail.co.uk/news/article-4486314/Armed-police-Gare-du-Nord-Paris-station-evacuated.html moves in the way that I have tried to describe. I am using Firefox 52.1 in openSUSE.