@Chris Coulson. Just had a look into /var/log... it seems there is a failure earlier, and not just for firefox.
gnomeplayer reported a crash... ERROR: apport (pid 16477) Mon Feb 24 10:08:16 2014: called for pid 16447, signal 5, core limit 0 ERROR: apport (pid 16477) Mon Feb 24 10:08:16 2014: executable: /usr/bin/gnome-mplayer (command line "/usr/bin/gnome-mplayer --window=54102218 --controlid=25263 --width=1600 --height=674 --autostart=1 --showcontrols=1") ERROR: apport (pid 16477) Mon Feb 24 10:08:16 2014: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ERROR: apport (pid 16477) Mon Feb 24 10:08:16 2014: debug: session gdbus call: ERROR: apport (pid 16477) Mon Feb 24 10:08:22 2014: wrote report /var/crash/_usr_bin_gnome-mplayer.1000.crash ERROR: apport (pid 17555) Mon Feb 24 11:18:04 2014: called for pid 4535, signal 11, core limit 0 Now when firefox then crashed out..... ERROR: apport (pid 17555) Mon Feb 24 11:18:04 2014: executable: /usr/lib/firefox/firefox (command line "/usr/lib/firefox/firefox") ERROR: apport (pid 17555) Mon Feb 24 11:18:04 2014: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ERROR: apport (pid 17555) Mon Feb 24 11:18:04 2014: debug: session gdbus call: ERROR: apport (pid 17555) Mon Feb 24 11:19:18 2014: wrote report /var/crash/_usr_lib_firefox_firefox.1000.crash Hope this is of help... I've taken a backup of /var/log in case you need it in its entireity (I did some re-boots, tried re-installing etc). -- 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/1278062 Title: firefox crashes on startup (but apparently layunched properly to enable me to post this) Status in “firefox” package in Ubuntu: Confirmed Bug description: I tried launching from a terminal window after the first crash and got this: ~$ firefox (process:2974): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed Segmentation fault (core dumped) ~$ ==================== ~$ lsb_release -rd Description: Ubuntu Trusty Tahr (development branch) Release: 14.04 ~$ apt-cache policy firefox firefox: Installed: 25.0+build3-0ubuntu0.13.10.1 Candidate: 25.0+build3-0ubuntu0.13.10.1 Version table: *** 25.0+build3-0ubuntu0.13.10.1 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status ~$ ProblemType: Crash DistroRelease: Ubuntu 14.04 Package: firefox 25.0+build3-0ubuntu0.13.10.1 ProcVersionSignature: Ubuntu 3.13.0-8.27-generic 3.13.2 Uname: Linux 3.13.0-8-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.13.2-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: a 1919 F.... pulseaudio BuildID: 20131028112446 CRDA: Error: [Errno 2] No such file or directory: 'iw' Channel: Unavailable CrashCounter: 1 CurrentDesktop: LXDE Date: Sun Feb 9 05:43:26 2014 ExecutablePath: /usr/lib/firefox/firefox ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2013-11-22 (78 days ago) InstallationMedia: Lubuntu 14.04 "Trusty Tahr" - Alpha amd64 (20131102) IpRoute: default via 192.168.0.1 dev wlan0 proto static 192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.101 metric 9 MostRecentCrashID: bp-3359569a-fc3a-40e2-978d-e68d72120711 PrefSources: prefs.js [Profile]/extensions/{3d7eb24f-2740-49df-8937-200b1cc08f8a}/defaults/preferences/flashblock.js [Profile]/extensions/{0545b830-f0aa-4d7e-8820-50a4629a56fe}/defaults/preferences/defaults.js ProcCmdline: /usr/lib/firefox/firefox Profiles: Profile0 (Default) - LastVersion=25.0/20131028112446 RelatedPackageVersions: gecko-mediaplayer 1.0.8-4ubuntu1 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no RunningIncompatibleAddons: False SegvAnalysis: Skipped: missing required field "Disassembly" Signal: 11 SourcePackage: firefox SubmittedCrashIDs: bp-3359569a-fc3a-40e2-978d-e68d72120711 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 02/17/2009 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 5.12 dmi.board.name: NutMeg dmi.board.vendor: PEGATRON CORPORATION dmi.board.version: 1.02 dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Hewlett-Packard dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.12:bd02/17/2009:svnHP-Pavilion:pnFQ578AAR-ABAs3707c:pvr:rvnPEGATRONCORPORATION:rnNutMeg:rvr1.02:cvnHewlett-Packard:ct3:cvrChassisVersion: dmi.product.name: FQ578AAR-ABA s3707c dmi.sys.vendor: HP-Pavilion To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1278062/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp