Adapt Widevine CDM from Google Chrome to work in Firefox as a GMP plugin.
Mainline version of Firefox doesn't have necessary bits of EME
implemented yet, but Firefox Nightly already have them working.
(January 2016). I used source snapshot 29258f59e545 from
mozilla-central with firefox.patch applied. It
remained unknown to me where Firefox looks up for GMP plugins, so
MOZ_GMP_PATH environment variable was used instead. Note, it should
point to directory path which ends with .../gmp-widevine/1. So one
should create directory gmp-widevine somewhere, then directory 1
(a number, one) inside it, then copy
data/widevine.info and generated
libwidevine.so there.
Here
one can find original description of how that method works. Maybe one
will have to use LD_PRELOAD to preload
/opt/google/chrome/libwidevinecdm.so, since adapter can't do it
itself due to sandboxing.
To test, go to [https://shaka-player-demo.appspot.com] and select a stream with "Widevine" or "multi-DRM". You could also try Netflix or Google Play, but you have to change User-Agent to Chrome.
There is less invasive way: see how-to-enable-on-firefox-47.md.
Firefox 49 have full Widevine support. (On Linux too).