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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.