Works for me ... just tried it with a new profile and Add-ons Manager lists it 
as there and available

However, using about:plugins, and it lists it as being installed in the user 
profile directory:

    File: system-installed
    Path: 
/path/to/my/home/dir/.mozilla/firefox/profiledir/gmp-gmpopenh264/system-installed
    Version: system-installed
    State: Enabled

So I guess it gets copied in when you start Firefox ?

I did the above using the latest 52.2.0 release candidate for linux.x86_64 
running on CentOS 7.3 downloaded from:

http://archive.mozilla.org/pub/firefox/candidates/52.2.0esr-candidates/build1/linux-x86_64/

My central autoconf cfg file has:

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

James Pearson

________________________________________
From: Ignaz Forster [[email protected]]
Sent: 08 June 2017 19:02
To: [email protected]; James Pearson
Subject: Re: [Mozilla Enterprise] automating first-run tasks (changing  
application handlers, preinstalled plugins)

Am 12.05.2017 20:49, schrieb James Pearson:
> Extract the contents and put them in a folder under your Firefox install 
> location:
>
>   browser/plugins/gmp-gmpopenh264/system-installed/

This solution seems very promising, but unfortunately I wasn't able to
get it to work. Are you sure the directory is working for you without
any further changes?

I'll have a more detailled look at it tomorrow, but at least my first
impression from looking at
https://github.com/mozilla/gecko-dev/blob/esr52/toolkit/mozapps/extensions/internal/GMPProvider.jsm#L152
is that GMP plugins other than "gmp-clearkey" will only be found in the
user profile. strace also seems to confirm this, as I can see no file
access to the .so files (or even the "system-installed" directory) there...

Maybe an interesting question in this regard: Are you using a
custom-built, Mozilla's or the distribution's Firefox packages? And in
the last case: Which Linux distribution are you using?

Thanks a lot,
--

Ignaz Forster

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