Since updating to Safari 12 (on macOS 10.13.6) and the new Adblock Plus app, all videos on youtube.com play extremely fast, through to the end as soon as I hit play. Disabling Adblock Plus on youtube.com fixes this.
However, embedded videos on other sites exhibit the same behavior. So I need to disable Adblock Plus on each site with an embed.
Any thoughts? Anyone else experiencing this?