I have installed
$ firefox --version
Mozilla Firefox 53.0
on ubuntu
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
After enable DRM checkbox in about:preferences#content I could find the CDM plugin under about:addons. But if I try to playback a video a message appears to contact service with respect to error code 7031. I called the service and they mentioned it is not possible to playback videos in Linux. Is that true?
