01-17-2020, 11:00 PM
The steps below worked for me in getting Amazon Prime Video working in firefox. I'm assuming they'll also enable Netflix, but who knows. It's possible some subset of these instructions is enough, but I'm just going to spew out everything I did before it started working. If someone else wants to figure out what subset of these steps is needed to get it working, be my guest. 
I've basically borrowed liberally from this how-to:
https://www.reddit.com/r/firefox/comment...plugin_to/
..and borrowed values as needed from the widevine files on my Windows desktop machine. Not all of this may be necessary. e.g., Rather than put in the incorrect version number for widevine (I have no idea what version is on my system), I'm just using 0. Likewise, x-cdm-codecs is taken from my windows machine so it could be completely wrong for the platform..
Steps:
1. Make sure widevine is up-to-date and working in chromium on your PBP, because we're going to 'borrow' those libs.
2. Figure out what your mozilla profile directory is (about
upport, see "Profile Folder")
3. Open a terminal and change to that directory.
4. mkdir -p gmp-widevinecdm/0/ && cd gmp-widevinecdm/0/
5. cp /usr/lib/chromium-browser/libwidevinecdm* .
6. create a file called manifest.json, and fill it with:
{
"name": "WidevineCdm",
"description": "Widevine Content Decryption Module",
"version": "0",
"x-cdm-module-versions": "4",
"x-cdm-interface-versions": "10",
"x-cdm-host-versions": "10",
"x-cdm-codecs": "vp8,vp9.0,avc1",
"x-cdm-persistent-license-support": true
}
7. Open firefox, and open about:config. Create the following entries:
media.gmp-widevinecdm.version - string - "0"
media.gmp-widevinecdm.visible - bool - true
media.gmp-widevinecdm.enabled - bool - false
and then change the following already-existing entries:
media.eme.enabled - true
media.eme.encrypted-media-encryption-scheme.enabled - true
8. Open about:addons. You should now see an entry for Widevine. Click on the drop down on the right, and select Always enabled.
I've basically borrowed liberally from this how-to:
https://www.reddit.com/r/firefox/comment...plugin_to/
..and borrowed values as needed from the widevine files on my Windows desktop machine. Not all of this may be necessary. e.g., Rather than put in the incorrect version number for widevine (I have no idea what version is on my system), I'm just using 0. Likewise, x-cdm-codecs is taken from my windows machine so it could be completely wrong for the platform..
Steps:
1. Make sure widevine is up-to-date and working in chromium on your PBP, because we're going to 'borrow' those libs.
2. Figure out what your mozilla profile directory is (about
upport, see "Profile Folder")3. Open a terminal and change to that directory.
4. mkdir -p gmp-widevinecdm/0/ && cd gmp-widevinecdm/0/
5. cp /usr/lib/chromium-browser/libwidevinecdm* .
6. create a file called manifest.json, and fill it with:
{
"name": "WidevineCdm",
"description": "Widevine Content Decryption Module",
"version": "0",
"x-cdm-module-versions": "4",
"x-cdm-interface-versions": "10",
"x-cdm-host-versions": "10",
"x-cdm-codecs": "vp8,vp9.0,avc1",
"x-cdm-persistent-license-support": true
}
7. Open firefox, and open about:config. Create the following entries:
media.gmp-widevinecdm.version - string - "0"
media.gmp-widevinecdm.visible - bool - true
media.gmp-widevinecdm.enabled - bool - false
and then change the following already-existing entries:
media.eme.enabled - true
media.eme.encrypted-media-encryption-scheme.enabled - true
8. Open about:addons. You should now see an entry for Widevine. Click on the drop down on the right, and select Always enabled.