Bug#840448: firefox: HTML5 media features not working with jackd running

[Thomas Bartscher]

Package: firefox
Version: 49.0-4
Severity: normal

When starting jackd (via qjackctl) HTML5 media features stop working.
YouTube videos and others still load, but playback does not start.
Connecting the system sound to the Discord chat service is not possible. The microphone
connection is accepted by Firefox itself, but Discord cannot detect it.

After stopping jackd, the features in question work immediately without reloading or any
other kind of additional action.

This has been tried and reproduced in the safe mode of Firefox.


-- Package-specific info:

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

Name: Duplicate Tabs Closer
Location: ${PROFILE_EXTENSIONS}/jid0-RvYT2rGWfM8q5yWxIxAHYAeo5Qg at jetpack.xpi
Status: enabled

Name: Fimfiction - Remove "Mark All Favorites Read" userstyle
Status: enabled

Name: FiMFiction.net Background Recolorizer userstyle
Status: user-disabled

Name: German Dictionary dictionary
Location: ${PROFILE_EXTENSIONS}/de-DE at dictionaries.addons.mozilla.org
Status: enabled

Name: HTTPS Everywhere
Location: ${PROFILE_EXTENSIONS}/https-everywhere at eff.org.xpi
Status: enabled

Name: Multi-process staged rollout
Location: ${PROFILE_EXTENSIONS}/e10srollout at mozilla.org.xpi
Status: enabled

Name: NoScript
Location: ${PROFILE_EXTENSIONS}/{73a6fe31-595d-460b-a920-fcc0f8843232}.xpi
Status: enabled

Name: Pocket
Location: ${PROFILE_EXTENSIONS}/firefox at getpocket.com.xpi
Status: enabled

Name: Private Tab
Location: ${PROFILE_EXTENSIONS}/privateTab at infocatcher.xpi
Status: enabled

Name: Profile Buttons
Location: ${PROFILE_EXTENSIONS}/profile-buttons-single at codefisher.org.xpi
Status: enabled

Name: Stylish
Location: ${PROFILE_EXTENSIONS}/{46551EC9-40F0-4e47-8E18-8E5CF550CFB8}.xpi
Status: enabled

Name: Stylish Sync
Location: ${PROFILE_EXTENSIONS}/{0e3fc079-afbb-4a00-87e5-9486062d0f9c}.xpi
Status: enabled

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

Name: Video DownloadHelper
Location: ${PROFILE_EXTENSIONS}/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}.xpi
Status: enabled

Name: Web Compat
Location: ${PROFILE_EXTENSIONS}/webcompat at mozilla.org.xpi
Status: enabled

-- Plugins information
Name: IcedTea-Web Plugin (using IcedTea-Web 1.6.2 (1.6.2-3))
Location: /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
Package: icedtea-8-plugin:amd64
Status: enabled

Name: Shockwave Flash (11.2.202.635)
Location: /usr/lib/flashplugin-nonfree/libflashplayer.so
Status: enabled


-- Addons package information
ii  firefox        49.0-4       amd64        Mozilla Firefox web browser
ii  icedtea-8-plug 1.6.2-3      amd64        web browser plugin based on OpenJ

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages firefox depends on:
ii  debianutils               4.8
ii  fontconfig                2.11.0-6.7
ii  libasound2                1.1.2-1
ii  libatk1.0-0               2.22.0-1
ii  libc6                     2.24-3
ii  libcairo2                 1.14.6-1+b1
ii  libdbus-1-3               1.10.10-1
ii  libdbus-glib-1-2          0.108-1
ii  libevent-2.0-5            2.0.21-stable-2+b1
ii  libffi6                   3.2.1-6
ii  libfontconfig1            2.11.0-6.7
ii  libfreetype6              2.6.3-3+b1
ii  libgcc1                   1:6.1.1-11
ii  libgdk-pixbuf2.0-0        2.36.0-1
ii  libglib2.0-0              2.50.0-2
ii  libgtk2.0-0               2.24.31-1
ii  libhunspell-1.4-0         1.4.1-2
ii  libnspr4                  2:4.12-2
ii  libnss3                   2:3.26-2
ii  libpango-1.0-0            1.40.3-2
ii  libsqlite3-0              3.14.2-1
ii  libstartup-notification0  0.12-4
ii  libstdc++6                6.1.1-11
ii  libvpx4                   1.6.0-2
ii  libx11-6                  2:1.6.3-1
ii  libxcomposite1            1:0.4.4-1
ii  libxdamage1               1:1.1.4-2+b1
ii  libxext6                  2:1.3.3-1
ii  libxfixes3                1:5.0.2-1
ii  libxrender1               1:0.9.9-2
ii  libxt6                    1:1.1.5-1
ii  procps                    2:3.3.12-2
ii  zlib1g                    1:1.2.8.dfsg-2+b1

firefox recommends no packages.

Versions of packages firefox suggests:
ii  fonts-lmodern          2.004.5-3
ii  fonts-stix [otf-stix]  1.1.1-4
ii  libcanberra0           0.30-3
ii  libgnomeui-0           2.24.5-3.1
ii  libgssapi-krb5-2       1.14.3+dfsg-2
pn  mozplugger             <none>

-- no debconf information