I'm on a MacBook Pro, running OSX 10.11.4 and browsing with Safari. I cannot figure out how to stop videos from autoplaying (particularly in Yahoo and CNN). It wasn't a problem in Yosemite, but since I reluctantly downloaded El Capitan, the security configuration block seems to have stopped working.
I'm doing the same thing I've always done: Safari tab > Preferences > Advanced > select "stop plug in's to save power", then Preferences > Security > Plug-in Settings > selecting plug in from currently open page, and selecting "Block". That was always sufficient in the past to stop autoplay from CNN and Yahoo. Now it doesn't work.
Did Apple deliberately reduce the functionality of this feature to appease website developers? Is there another way to stop these videos? Is it time to just scrap Safari and do all my browsing in Firefox or Chrome?