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[Jan Henke <1439532@xxxxxxxxxxxxxxxxxx>]

As written above on another machine with 14.04 MSE works. I also have
the ubuntu-restricted-extras package installed.

I double checked and have the libavcodec-extra-56 package installed. So
it should work. If Ubuntu decides to deactivate that feature
nevertheless it is a bug and you must at least provide a way to re
enable it. The MSE is an important feature of this Firefox release,
simply deactivating removes some functionality from Firefox that is used
by a lot of people.

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https://bugs.launchpad.net/bugs/1439532

Title:
  Firefox 37 does not enable MSE required for YouTube HTML5 player

Status in firefox package in Ubuntu:
  New

Bug description:
  After today's update to Firefox 37, the HTML5 video play on YouTube
  should work with hight resolutions that 720p. On a 14.04 installation
  it does work, but on my 15.04 installation it does not. This feature
  is part of the official Mozilla change log, so it must be a packaging
  bug.

  You can verify the status of MSE on this YouTube page:
  www.youtube.com/html5 . Firefox 37 is supposed to support all, but the
  last feature (VP9 with MSE). But Firefox on vivid apparently only
  supports the top row, in sufficient to watch higher resolution video.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: firefox 37.0+build2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3
  Uname: Linux 3.19.0-11-generic x86_64
  NonfreeKernelModules: wl
  AddonCompatCheckDisabled: False
  ApportVersion: 2.17-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   jan        1466 F...m pulseaudio
   /dev/snd/controlC0:  jan        1466 F.... pulseaudio
   /dev/snd/controlC1:  jan        1466 F.... pulseaudio
  BuildID: 20150328222441
  Channel: Unavailable
  CurrentDesktop: GNOME
  Date: Thu Apr  2 08:38:36 2015
  EcryptfsInUse: Yes
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2015-01-30 (61 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static  metric 1024 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.29
  Locales: extensions.sqlite corrupt or missing
  MostRecentCrashID: bp-208cf555-adf2-48d2-adf5-fa49e2150319
  Plugins:
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
   Gnome Shell Integration - /usr/lib/mozilla/plugins/libgnome-shell-browser-plugin.so (gnome-shell)
  PrefSources:
   prefs.js
   [Profile]/extensions/{8f8fe09b-0bd3-4470-bc1b-8cad42b8203a}/defaults/preferences/prefs.js
   /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@xxxxxxxxxx/defaults/preferences/001ubuntu-gnome-mods.js
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=37.0/20150328222441 (In use)
  RelatedPackageVersions: gnome-shell 3.14.4-0ubuntu1
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs: bp-208cf555-adf2-48d2-adf5-fa49e2150319
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to vivid on 2015-03-19 (13 days ago)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0310JH
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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