They're annoying even if they're legitimate, like CNN having an auto-play video (even on mobile) at the top of every news article. I use firefox, so I disabled

They're annoying even if they're legitimate, like CNN having an auto-play video (even on mobile) at the top of every news article. I use firefox, so I disabled them all using media.autoplay.enabled = false. That solved it, but it made Youtube embeds and a few other things work a little funny.