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This was listed as a key feature of this release in the beta notes up until yesterday.

Did they just remove it from the notes, or from the release?

"Beginning in version 47, Firefox desktop also supports the Google Widevine CDM"

I think it is now auto-configured to detect if it is installed. Or at least that was supposed to be one of the features of this release.

I think Linux support is still only in nightly.

I've tried it out with Netflix but out only works if you spoof your user agent to chrome on Linux, and it's prone to crashing.