I just upgraded to 15.10. I created a new account to replicate the bug, so no old settings would interfere.
I launch firefox, go through some tabs, and within a few minutes it freezes. This happens over and over when I try to use firefox. This did not happen on 15.04. But when I upgraded to 15.10, it started happening. Again, I just created this account on this machine, so it has all the default settings. I did all the apt-get upgrades and rebooted the machine right before launching firefox to capture this last freeze. Here is what it says on the command line: $ firefox org.gtk.vfs.MountTracker.listMountableInfo call failed: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.168" (uid=1003 pid=11496 comm="/usr/lib/firefox/firefox ") interface="org.gtk.vfs.MountTracker" member="ListMountableInfo" error name="(unset)" requested_reply="0" destination=":1.9" (uid=1003 pid=3125 comm="/usr/lib/gvfs/gvfsd ") (g-dbus-error-quark, 9) org.gtk.vfs.MountTracker.listMountableInfo call failed: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.171" (uid=1003 pid=11572 comm="/usr/lib/firefox/plugin-container -greomni /usr/li") interface="org.gtk.vfs.MountTracker" member="ListMountableInfo" error name="(unset)" requested_reply="0" destination=":1.9" (uid=1003 pid=3125 comm="/usr/lib/gvfs/gvfsd ") (g-dbus-error-quark, 9) Vector smash protection is enabled. 2.4+ kernel w/o ELF notes? -- report this (firefox:11496): GStreamer-WARNING **: External plugin loader failed. This most likely means that the plugin loader helper binary was not found or could not be run. You might need to set the GST_PLUGIN_SCANNER environment variable if your setup is unusual. This should normally not be required though. (firefox:11496): GLib-GObject-WARNING **: cannot register existing type 'GdkDisplay' (firefox:11496): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed (firefox:11496): GLib-GObject-CRITICAL **: g_type_register_static: assertion 'parent_type > 0' failed (firefox:11496): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed (firefox:11496): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed d^C testacct@backus:~/e$ [Child 11572] ###!!! ABORT: Aborting on channel error.: file /build/firefox-undGCc/firefox-42.0+build2/ipc/glue/MessageChannel.cpp, line 1768 [Child 11572] ###!!! ABORT: Aborting on channel error.: file /build/firefox-undGCc/firefox-42.0+build2/ipc/glue/MessageChannel.cpp, line 1768 -- 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: New 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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