Inexplicably, this add-on blocks videos from being able to play on espn.com, even when I disable it on the site. I confirmed by uninstalling all other extensions and restarting firefox. Still nothing. Then I started Firefox in safe mode and video played. Finally, I removed HTTPS Everywhere and videos on espn.com play. Then I reinstalled Ublock Origin and videos still played.
Very strange how this extension would block videos even when not enable on espn.com. Until that gets figured out, I will not reinstall this one.