With latest updates, GNOME Web (Epiphany) can play YouTube videos on the Librem 5, so you won't have to switch to Firefox to do that anymore. And you won't believe where the bug was located[1]! ;) Call `sudo apt install gstreamer1.0-libav` or wait a few days until it's installed by default with the next update and enjoy. @purism
[1] it was in glibc...
@danielst @purism If you installed gstreamer1.0-libav with the buggy glibc version it would break all video in Epiphany completely (which is why it wasn't installed by default until now).