Bug#834101: firefox-esr: YouTube videos won't play with mediasouce enabled for WebM

[Lisette]

Package: firefox-esr
Version: 45.3.0esr-1~deb8u1
Severity: normal

When playing any YouTube video, it will show buffering and play maybe a frame
or two and then just sit and spin as though it needs to buffer, but it never
plays.

If I set media.mediasource.enabled to false, then it works fine

If I set media.mediasource.webm.enabled and
media.mediasource.webm.audio.enabled to false, then it works fine

Setting media.mediasource.mp4.enabled to false has no effect



-- Package-specific info:

-- Extensions information
Name: Default theme
Location: /usr/lib/firefox-esr/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi
Package: firefox-esr
Status: enabled

Name: Disconnect
Location: ${PROFILE_EXTENSIONS}/2.0 at disconnect.me.xpi
Status: enabled

Name: Firefox Hello Beta
Location: ${PROFILE_EXTENSIONS}/loop at mozilla.org.xpi
Status: enabled

Name: HTTPS-Everywhere
Location: /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/https-everywhere at eff.org
Package: xul-ext-https-everywhere
Status: enabled

Name: Pin It button
Location: ${PROFILE_EXTENSIONS}/jid1-YcMV6ngYmQRA2w at jetpack.xpi
Status: enabled

Name: uBlock Origin
Location: ${PROFILE_EXTENSIONS}/uBlock0 at raymondhill.net.xpi
Status: enabled

Name: Y U no validate
Location: /usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/{20d36f97-15da-47ed-9f0a-13cbe85bdc84}
Package: xul-ext-y-u-no-validate
Status: enabled

-- Plugins information
Name: Citrix Receiver for Linux
Location: /opt/Citrix/ICAClient/npica.so
Package: icaclient
Status: enabled

Name: MozPlugger 1.14.5 handles QuickTime and Windows Media Player Plugin (1.14.5)
Location: /usr/lib/mozilla/plugins/mozplugger.so
Package: mozplugger
Status: enabled


-- Addons package information
ii  firefox-esr    45.3.0esr-1~ amd64        Mozilla Firefox web browser - Ext
ii  icaclient      13.2.0.32224 amd64        Citrix Receiver for Linux
ii  mozplugger     1.14.5-2     amd64        Plugin allowing external viewers 
ii  xul-ext-https- 4.0.2-3      all          extension to force the use of HTT
ii  xul-ext-y-u-no 2013052401-2 all          browser extension to make securit

-- System Information:
Debian Release: 8.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages firefox-esr depends on:
ii  debianutils               4.4+b1
iu  fontconfig                2.11.0-6.3+deb8u1
ii  libasound2                1.0.28-1
ii  libatk1.0-0               2.14.0-1
ii  libc6                     2.19-18+deb8u4
ii  libcairo2                 1.14.0-2.1+deb8u1
ii  libdbus-1-3               1.8.20-0+deb8u1
ii  libdbus-glib-1-2          0.102-1
ii  libevent-2.0-5            2.0.21-stable-2
ii  libffi6                   3.1-2+b2
iu  libfontconfig1            2.11.0-6.3+deb8u1
ii  libfreetype6              2.5.2-3+deb8u1
ii  libgcc1                   1:4.9.2-10
ii  libgdk-pixbuf2.0-0        2.31.1-2+deb8u5
ii  libglib2.0-0              2.42.1-1+b1
ii  libgtk2.0-0               2.24.25-3+deb8u1
ii  libhunspell-1.3-0         1.3.3-3
ii  libpango-1.0-0            1.36.8-3
ii  libsqlite3-0              3.8.7.1-1+deb8u1
ii  libstartup-notification0  0.12-4
ii  libstdc++6                4.9.2-10
ii  libx11-6                  2:1.6.2-3
ii  libxcomposite1            1:0.4.4-1
ii  libxdamage1               1:1.1.4-2+b1
ii  libxext6                  2:1.3.3-1
ii  libxfixes3                1:5.0.1-2+b2
ii  libxrender1               1:0.9.8-1+b1
ii  libxt6                    1:1.1.4-1+b1
ii  procps                    2:3.3.9-9
ii  zlib1g                    1:1.2.8.dfsg-2+b1

Versions of packages firefox-esr recommends:
ii  gstreamer1.0-libav         1.4.4-2
ii  gstreamer1.0-plugins-good  1.4.4-2

Versions of packages firefox-esr suggests:
pn  fonts-lmodern          <none>
pn  fonts-stix | otf-stix  <none>
ii  libcanberra0           0.30-2.1
pn  libgnomeui-0           <none>
ii  libgssapi-krb5-2       1.12.1+dfsg-19+deb8u2
ii  mozplugger             1.14.5-2

-- no debconf information