Firefox 66.0.2+build1-Oubuntu0.18.04.1 will not play online video or audio on Odroid XU4, UBUNTU Mate 18.04
I have an Odroid XU4 with Ubuntu Mate 18.04 OS, 128 Gig eMMC main/system memory and 250 GB USB3 stick extra storage. My Internet access is LAN to DSL modem/router (15.1 Mbps down and 1.89 Mbps up). The video and audio works correctly when I select the same Internet content using a Chromium browser. I have used Firefox for years and would much prefer its user interface to that of Chromium. I have spent hours trying various "fixes" proposed by Internet helpers - most involving simple to complex command line procedures - none of which worked.
ప్రత్యుత్తరాలన్నీ (1)
If the site is using a HTML5 player and not the Flash Player Plugin then that may be a reason.
On Linux one of the restricted things not normally installed on a distro install is FFmpeg. It is used for codecs support.
Do you get all check marks as blue on say https://www.youtube.com/html5/ ?
If H.264 and MSE & H.264 are red then you may be missing FFmpeg.