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[skomorokh <skomorokh@xxxxxxxxxxx>]

I ran into this myself. From the above it looks like you use apparmor
too so it's probably the same problem I had---Firefox uses GStreamer and
15.10 shipped a new version which changes the path. Try running your
browser unconfined to see if it fixes the problem and then use complain
mode to identify which files you need to give it access to. For me it
was these:

/usr/lib/x86_64-linux-gnu/gstreamer1.0/gstreamer-1.0/gst-plugin-scanner
/home/myuser/.cache/gstreamer-1.0/registry.x86_64.bin

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1521789

Title:
  firefox freezes with GStreamer-WARNING **: External plugin loader
  failed.

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  firefox freezes

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: firefox 42.0+build2-0ubuntu0.15.10.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  BuildID: 20151030083518
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Tue Dec  1 17:55:35 2015
  ExecutablePath: /usr/lib/firefox/firefox
  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)
  IpRoute:
   default via 10.128.128.128 dev wlan0  proto static  metric 600
   10.0.0.0/8 dev wlan0  proto kernel  scope link  src 10.194.251.198  metric 600
   169.254.0.0/16 dev wlan0  scope link  metric 1000
  Locales: extensions.sqlite corrupt or missing
  Plugins:
   iTunes Application Detector - /usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so (rhythmbox-mozilla)
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
  PrefSources: prefs.js
  ProcAttrCurrent: /usr/lib/firefox/firefox{,*[^s][^h]} (enforce)
  Profiles: Profile0 (Default) - LastVersion=42.0/20151030083518
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to wily on 2015-11-22 (9 days ago)
  dmi.bios.date: 06/23/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.03.05RS761
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Gazelle Professional
  dmi.board.vendor: System76, Inc.
  dmi.board.version: gazp9b
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: System76, Inc.
  dmi.chassis.version: gazp9b
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.03.05RS761:bd06/23/2014:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp9b:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp9b:cvnSystem76,Inc.:ct9:cvrgazp9b:
  dmi.product.name: Gazelle Professional
  dmi.product.version: gazp9b
  dmi.sys.vendor: System76, Inc.

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