I'm trying to watch Netflix on Firefox 53.0 (Fedora 24).
When I try to watch any video, I get the following error message:
CREATE: Request mediaKeySystem access rejected: EME has been preffed off
Accoridng to the Netflix support pages (and I tested and confirmed it on my computer), in order for Firefox to be able to play Netflix video, you need to:
Enable playback of HTML5 DRM media in Firefox. To do that, type
about:preferences#content on the addres bar, and check "Play DRM Content".
Try to watch the DRM-protected Netflix video again.
Wait for Firefox to automatically install the "Widevine Content Decryption Module provided by Google, Inc" plugin (Firefox will automatically install it when you first try to watch any Netflix video).
you can check that it is installed by visiting
about:addons and clicking "plugins", there will be an entry named "Widevine Content Decryption Module provided by Google, Inc"