After using the Disable HTML5 Autoplay extension for several years, it is now gone. As I discovered on doing a clean system re-install and attempting to find the extension.
Without it, CNN and other sites now automatically play HTML5 news, which comes blaring out inconveniently during meetings or other times when I am simply attempting to find subjects for group discussion, or working on a tablet in bed at night.
Research tells me that not only is there no equivalent broad-site HTML5 blocker, but that Google wants to keep it that way in Chrome and Chromium, and is fighting any extensions and settings.
So I find myself having to migrate all my news bookmarks back to Firefox, which has a setting to block autoplay for all sites, and return to Firefox being my default browser.
Opera needs to restore the ability to block HTML5 autoplay.