Epiphany version : 3.36.0-27-g2a31b3fdc WebKitGTK 2.28.0 Here's a video showcasing the issue : https://youtu.be/uP4wMjU34dU?t=37 But the TLDW is : Changing the playback speed through Youtube's UI does not result in any change of speed. I'm unsure if this is related to GStreamer.
(The [STABLE] tag is used for bugs where you've verified the issue is fixed in trunk and only applies to the stable branch.)
This should be fixed when 2.28.1 is released. *** This bug has been marked as a duplicate of bug 208454 ***