Hi James,
Thanks for the good info. For the Widevine plugin, I like that media.eme.enabled=false disables its auto-download on startup and offers a "download and install on first use" scenario: [cid:[email protected]] URL: https://bitmovin.com/mpeg-dash-hls-drm-test-player/ However, for the OpenH264 plugin, the best I was able to come up with is just disable it even before it attempts to download it by setting media.gmp-gmpopenh264.enabled = false. Every other combination of preferences I tried kept allowing OpenH264 to auto-download-and-install in the background on startup instead of replicating how I got Widevine to function now. Hopefully this won't break any sites our students have used or plan to use in the future. If I later find that something breaks though, I have a way to clear this preference and let Firefox go back to auto-downloading it *every time* for every student who uses our lab and classroom computers. Thanks for the idea of preloading these plugins. If this works and I later decide to go down this road, I'll have to come up with a good deployment strategy for keeping newly-imaged systems' Firefox plugins always up to date. :) I'm not sure if CCK2 handles its managed preferences as a default pref, a user pref, or choice to set it either way. -- Scott Copus, Lab Systems Engineer Academic Technology | Western Kentucky University http://www.wku.edu/it/labs -----Original Message----- From: James Pearson [mailto:[email protected]] Sent: Friday, May 12, 2017 1:50 PM To: Copus, Scott <[email protected]>; [email protected] Subject: RE: [Mozilla Enterprise] automating first-run tasks (changing application handlers, preinstalled plugins) [email protected]<mailto:[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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