[email protected]:
>
> Second, is there a way to pre-install (to a fresh new profile) the default 
> video codecs
> (Widevine/OpenH264/etc) so they’re available IMMEDIATELY at launch and not 
> wait for
> Firefox to download them?

This is what I've done (on Linux, but it should work fine on other platforms?) 
for openh264 for ESR 52:

Get the location of the download via the the source code: 

 
https://hg.mozilla.org/releases/mozilla-esr52/file/tip/toolkit/content/gmp-sources/openh264.json

Download the zip file suitable for your platform

Extract the contents and put them in a folder under your Firefox install 
location:

 browser/plugins/gmp-gmpopenh264/system-installed/

(or browser\plugins\gmp-gmpopenh264\system-installed\ on Windows?)

i.e. the files: gmpopenh264.info and libgmpopenh264.*

Then, in your autoconfig cfg file add the lines:

pref("media.gmp-gmpopenh264.autoupdate", false);
pref("media.gmp-gmpopenh264.enabled", true);
defaultPref("media.gmp-gmpopenh264.version", "system-installed");

This will enable the plugin and prevent it from updating - I had to use 
defaultPref() for the version to get it to work

I haven't needed Widevine - but I guess something similar may work ?

Location of the download from:

 
https://hg.mozilla.org/releases/mozilla-esr52/file/tip/toolkit/content/gmp-sources/widevinecdm.json

 James Pearson
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