How do I stop floating/sticky videos

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I use Firefox web browser v60.0.2 (64 bit) and my OS is Windows 8.1 (64 bit). I know how to stop web page videos from autoplaying but how do I stop the video frame from following me as I scroll down the web page? I believe this action is called various names such as “floating video”, “sticky video” and “floating frame” and it is activated by the user scrolling action causing the video frame to stay on-screen in the bottom right hand corner. I believe this excessive “in-your-face and hiding web page content” issue has been around for a couple of years now and searches have revealed many people complaining about this aggressive behaviour but I can’t find any answers as to how to stop it happening. I don’t mind the videos themselves but I do not want them following me around. There are some suggestions out there (browser add-ons and java-script in greasemonky) but none work so I thought I would ask in this forum. Any ideas anyone? Thanks in advance.