There's more:

  dbus (send)
       bus=session
       interface=org.gnome.GConf.Database,
  dbus (send)
       bus=session
       interface=org.gtk.Private.RemoteVolumeMonitor,
  dbus (send)
       bus=session
       interface=org.freedesktop.DBus,
  dbus (receive, send)
       bus=session
       interface=ca.desrt.dconf.Writer,


mitigate syslog entries which occur when I click the file upload dialog at 
https://uploadfiles.io/:

Jan 30 11:24:31 lat61 dbus[3005]: apparmor="DENIED"
operation="dbus_method_call"  bus="session"
path="/org/gnome/GConf/Database/0" interface="org.gnome.GConf.Database"
member="LookupExtended" mask="send" name="org.gnome.GConf" pid=18514
label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3192
peer_label="unconfined" info="No such file or directory"

Jan 30 11:55:55 lat61 dbus[3005]: apparmor="DENIED"
operation="dbus_method_call"  bus="session"
path="/org/gtk/Private/RemoteVolumeMonitor"
interface="org.gtk.Private.RemoteVolumeMonitor" member="IsSupported"
mask="send" name=":1.38" pid=25377
label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3226
peer_label="unconfined"

Jan 30 12:08:15 lat61 dbus[3005]: apparmor="DENIED"
operation="dbus_method_call"  bus="session" path="/org/freedesktop/DBus"
interface="org.freedesktop.DBus" member="StartServiceByName" mask="send"
name="org.freedesktop.DBus" pid=25377
label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_label="unconfined"
info="No such file or directory"


ca.desrt.dconf.Writer receive:
Jan 30 12:14:29 lat61 dbus[3005]: apparmor="DENIED" operation="dbus_signal"  
bus="session" path="/ca/desrt/dconf/Writer/user" 
interface="ca.desrt.dconf.Writer" member="Notify" name=":1.30" mask="receive" 
pid=25377 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3201 
peer_label="unconfined"

ca.desrt.dconf.Writer send:
Jan 30 11:12:36 lat61 gnome-session[3140]: (firefox:18514): dconf-WARNING **: 
failed to commit changes to dconf: 
GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy 
prevents this sender from sending this message to this recipient; 
type="method_call", sender=":1.501" (uid=1000 pid=18514 
comm="/usr/lib/firefox/firefox ") interface="ca.desrt.dconf.Writer" 
member="Change" error name="(unset)" requested_reply="0" 
destination="ca.desrt.dconf" (uid=1000 pid=3201 
comm="/usr/lib/dconf/dconf-service ")

Will be part of VERSION 6 of the patch at
https://bugs.launchpad.net/bugs/1659988

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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/1660287

Title:
  Apparmor blocking FF to access org.gtk.vfs.Daemon and Mount

Status in firefox package in Ubuntu:
  New

Bug description:
  Taken from syslog:

  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/Daemon" 
interface="org.gtk.vfs.Daemon" member="GetConnection" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/Daemon" 
interface="org.gtk.vfs.Daemon" member="GetConnection" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/Daemon" 
interface="org.gtk.vfs.Daemon" member="GetConnection" mask="send" name=":1.262" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=17827 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/mount/1" 
interface="org.gtk.vfs.Mount" member="QueryInfo" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/mount/1" 
interface="org.gtk.vfs.Mount" member="Enumerate" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/mount/1" 
interface="org.gtk.vfs.Mount" member="Enumerate" mask="send" name=":1.262" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=17827 
peer_label="unconfined"
  Jan 30 11:12:29 lat61 gnome-session[3140]: (firefox:18514): Gtk-WARNING **: 
Failed to fetch network locations: An AppArmor policy prevents this sender from 
sending this message to this recipient; type="method_call", sender=":1.501" 
(uid=1000 pid=18514 comm="/usr/lib/firefox/firefox ") 
interface="org.gtk.vfs.Mount" member="Enumerate" error name="(unset)" 
requested_reply="0" destination=":1.262" (uid=1000 pid=17827 
comm="/usr/lib/gvfs/gvfsd-network --spawner :1.8 /org/gt")
  Jan 30 11:12:34 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/Daemon" 
interface="org.gtk.vfs.Daemon" member="GetConnection" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"
  Jan 30 11:12:34 lat61 dbus[3005]: apparmor="DENIED" 
operation="dbus_method_call"  bus="session" path="/org/gtk/vfs/mount/1" 
interface="org.gtk.vfs.Mount" member="QueryInfo" mask="send" name=":1.77" 
pid=18514 label="/usr/lib/firefox/firefox{,*[^s][^h]}" peer_pid=3444 
peer_label="unconfined"

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 51.0.1+build2-0ubuntu0.16.04.1
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   thomas     3175 F...m pulseaudio
   /dev/snd/pcmC0D0p:   thomas     3175 F...m pulseaudio
   /dev/snd/controlC0:  thomas     3175 F.... pulseaudio
  BuildID: 20170125172221
  Channel: Unavailable
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Mon Jan 30 11:23:58 2017
  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 2014-11-29 (793 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  IpRoute:
   default via 192.168.178.1 dev wlan0  proto static  metric 600 
   169.254.0.0/16 dev docker0  scope link  metric 1000 linkdown 
   172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown 
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1 
linkdown 
   192.168.178.0/24 dev wlan0  proto kernel  scope link  src 192.168.178.22  
metric 600
  Locales: extensions.sqlite corrupt or missing
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=51.0.1/20170125172221 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to xenial on 2016-06-15 (228 days ago)
  dmi.bios.date: 12/06/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.name: 023HKR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA16:bd12/06/2013:svnDellInc.:pnLatitudeE5510:pvr0001:rvnDellInc.:rn023HKR:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5510
  dmi.product.version: 0001
  dmi.sys.vendor: Dell Inc.

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