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For a normal user, the problem is that the Play DRM content checkbox is hidden by default. In order to enable it, you must go to about:config and enable browse

For a normal user, the problem is that the Play DRM content checkbox is hidden by default. In order to enable it, you must go to about:config and enable browser.eme.ui.enabled. While you are there, you can just disable media.eme.enabled and media.eme.apiVisible.

cpeterso 11y ago
Are you on Linux? The "Play DRM content" checkbox is shown by default on Windows and Mac OS X.
- vetinari 11y ago
  The default for OSX is hidden - http://imgur.com/3AdT6Vs http://imgur.com/3AdT6Vs (46.0.1) On Windows, it is shown indeed (45.1.1 ESR).
  - cpeterso 11y ago
    Thanks for the correction. I forgot that EME support (using Google's Widevine CDM) won't ship on OS X until Firefox 47, which is still in the Firefox Beta channel for another few weeks.
    - vetinari 11y ago
      Thanks for the info.