All those annoying CNN auto-play videos will vanish, along with any videos you might have wanted. For me, it’s a reasonable tradeoff, as most (useful) videos will be available on Youtube or elsewhere.
Mostly, I don’t get news from CNN, but occasionally a link will lead there, a video appears, and instantly gets muted.
Burn them. Burn them all.
Update: Some sites run auto-play videos through JW Player, which you kill thusly:
That blocks the source of the player, which seems to not depend on the site using it. So far, so good.