This bug was fixed in the package firefox - 15.0+build1-0ubuntu0.11.10.1

---------------
firefox (15.0+build1-0ubuntu0.11.10.1) oneiric-security; urgency=low

  * New upstream stable release (FIREFOX_15_0_BUILD1)
    - see LP: #1041620 for USN information

  * Update globalmenu-extension to 3.4
    + Drop the edit UI workarounds
    + Fixes for LP: #1035305 - Crash when switching apps back to Firefox
      with Firebug installed
      - Keep the menu we export in sync with the document tree all of the
        time, rather than only when the menus are on screen. The HUD likes to
        open submenus without opening any of its ancestors, which can result in
        us handling events on menu nodes that are no longer in a document
        if an ancestor responds to a bubbled-up event by removing its
        children
      - Ensure we always null check the result of nsIDocument::GetCurrentDoc
    + When tearing down a menu, make sure that we empty out our DbusmenuMenuitem
      in case the parent reuses that item for another menu. Fixes a memory leak
      and an issue where Firebug menu items are duplicated indefinitely each
      time a menu is opened
    + Fixes for LP: #1025011 - HUD search crashes Firefox when Firebug
      is installed
      - Provide our own binding for menupopup nodes which derives from the
        default binding and makes the "state" property work as if there
        were a frame
      - Make all menu nodes reference counted, and hold a strong ref when
        dispatching events, in case the event results in the removal of menu
        nodes
    + Fix LP: #813775 - Hitting an assertion in dbusmenu
    + Fix LP: #861565 - No buttons in the "Show All Bookmarks" dialog
    + Fix LP: #775305 - An empty menu appears when FFChrome is installed
    + Add a small delay when opening the menu with the keyboard, so that
      the additional items are added before the menu appears. Fixes an
      issue where keyboard focus isn't on the first item when opening the
      history menu with the keyboard
  * Add Acholi to the locale blacklist
  * Separate the package name from the application name in various places.
    This enables us to change the package name without having to modify the
    application or packaging (eg, to allow us to provide official branded
    versions of Firefox ESR using the package name "firefox-esr")
    - update debian/README.Debian.in
    - update debian/apport/source_firefox.py.in
    - update debian/build/get-orig-source.mk
    - update debian/control{,.in}
    - update debian/control.langpacks
    - update debian/control.langpacks.unavail
    - update debian/firefox-locale.preinst.in
    - update debian/firefox.install.in
    - update debian/firefox.links.in
    - update debian/firefox.lintian-overrides.in
    - update debian/firefox.postinst.in
    - update debian/firefox.postrm.in
    - update debian/firefox.preinst.in
    - update debian/firefox.sh.in
    - remove debian/patches/change-moz-app-name.patch
    - update debian/patches/series
    - update debian/rules
    - update debian/usr.bin.firefox.apparmor.*
  * Move parts of debian/rules that can be shared with Thunderbird to a
    new, common file (mozbuild.mk)
    - update debian/rules
    - add debian/build/mozbuild.mk
    - add debian/build/mozvars.mk
    - update debian/build/testsuite.mk
  * Make it possible to use the same create-tarball.py for Firefox and
    Thunderbird
    - update debian/build/create-tarball.py
    - update debian/build/get-orig-source.mk
    - add debian/config/tarball.conf
  * Switch to source format 3.0
    - add debian/source/format
    - add debian/source/options to diff-ignore the .mozclient.mk file which
      is created during clean, and to pass "--no-preparation"
    - update debian/build/enable-dist-patches.pl
    - rename debian/patches/series => debian/patches/series.in so the source
      isn't built with patches applied
    - update debian/README.source
  * Goodbye embedded tarball, and our use of tarball.mk!
    - update debian/build/create-tarball.py
    - update debian/build/extract-file.py
    - update debian/build/get-orig-source.mk
    - update debian/build/mozbuild.mk
  * Run the upstream cleansrcdir target during clean
    - update debian/build/mozbuild.mk
  * Refresh patches
    - update debian/patches/mozilla-kde.patch
  * Support the "parallel" option in DEB_BUILD_OPTIONS
    - update debian/build/mozbuild.mk
    - update debian/config/mozconfig.in
  * Drop some of the complex shell script for creating language packs
    - update debian/build/mozbuild.mk
    - update debian/build/get-xpi-id.py
  * Drop searchplugin patches - these patches are an absolute pain to maintain,
    as they seem to break frequently and we have to touch each localized
    plugin. Instead, just keep our own copy of plugins we modify, and add
    these in to the language packs at the end of the build process
    - remove debian/patches/ubuntu-codes-google.patch
    - remove debian/patches/ubuntu-codes-amazon.patch
    - remove debian/patches/ubuntu-codes-baidu.patch
    - update debian/patches/series.in
    - update debian/build/mozbuild.mk
    - add debian/searchplugins/*
  * Get rid of pointless python script
    - remove debian/build/extract-file.py
    - update debian/build/mozbuild.mk
  * Add an automated check for finding search engines that match particular
    patterns and verifying that they are replaced with our own search
    engine if we think they should be
    - add debian/build/check-search-overrides.pl
    - update debian/build/mozbuild.mk
    - add debian/searchplugins/overrides.json
    - update debian/control{,.in}
  * Drop reload-new-plugins.patch, as this shouldn't actually be needed
    - remove debian/patches/reload-new-plugins.patch
    - update debian/patches/series.in
  * Merge get-orig-source.mk in to mozbuild.mk
    - update debian/build/mozbuild.mk
    - remove debian/build/get-orig-source.mk
  * Handle comments in locales.blacklist
    - update debian/build/refresh-supported-locales.pl
    - update debian/config/locales.blacklist
  * Fork the upstream text preprocessor and add support for additional
    comparison operators, which means we no longer have to add new
    defines for every distro version specific change we add
    - add debian/build/Expression.py
    - add debian/build/Preprocessor.py
    - update debian/apport/source_firefox.py.in
    - update debian/build/mozbuild.mk
    - update debian/config/mozconfig.in
    - update debian/firefox-dev.install.in
    - update debian/firefox-locale.preinst.in
    - update debian/firefox.desktop.in
    - update debian/firefox.dirs.in
    - update debian/firefox.install.in
    - update debian/firefox.links.in
    - update debian/firefox.postinst.in
    - update debian/firefox.postrm.in
    - update debian/firefox.preinst.in
    - update debian/firefox.prerm.in
    - update debian/rules
  * Refresh shipped locales
  * Drop powerpc patches, which are fixed upstream
    - remove debian/patches/fix-dtoa-build-on-ppc.patch and
    - remove debian/patches/fix-build-failure-without-yarr-jit.patch
    - update debian/patches/series.in
  * Drop fix-crashreporter-ftbfs-with-gcc4.7.patch, which is fixed upstream
 -- Chris Coulson <chris.coul...@canonical.com>   Sat, 25 Aug 2012 20:16:34 
+0100

** Changed in: firefox (Ubuntu Oneiric)
       Status: Fix Committed => Fix Released

** Changed in: firefox (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1035305

Title:
  Crash when switching apps back to Firefox (may be Firebug related)

Status in Web development evolved:
  Unknown
Status in “firefox” package in Ubuntu:
  Fix Released
Status in “firefox” source package in Natty:
  Fix Released
Status in “firefox” source package in Oneiric:
  Fix Released
Status in “firefox” source package in Precise:
  Fix Released
Status in “firefox” source package in Quantal:
  Fix Released

Bug description:
  When switching apps (with alt-tab, or clicking the Launcher) *to*
  Firefox, Firefox crashes.

  This does not occur for a while after reboot. However, once the first
  crash has happened, a restarted Firefox will reliably continue to
  crash every time it is switched *to*. So, starting Firefox works;
  restoring the previous session works; navigating around, choosing
  different tabs, adding new tabs works. Switching away from Firefox
  works. However, switching back to Firefox causes it to crash every
  time.

  A reboot cures the problem (until it starts again).

  Crash report sent to Mozilla (about a zillion times) and should be
  therefore attached to this bug by apport, but if not: https://crash-
  stats.mozilla.com/report/index/bp-dbbaef36-287e-4e2b-85bd-4ef8e2120810

  Disabling Firebug seems to have cured the problem.

  [SRU justification]
  Looking through Mozilla's crash database, we're currently responsible for 
about 1500 crash reports per week (taking in to account the different 
variations of this trace), second only to Flash

  See some comments from our very unhappy users -

  
https://crash-stats.mozilla.com/report/index/03c68f08-14ed-42ab-bb12-db4212120811
 :
  "browser keeps crashing as soon as i run it. cant do anything"

  
https://crash-stats.mozilla.com/report/index/fc95cd37-cdc9-458b-b373-d6a2d2120815
 :
  "Firefox keeps crashing everytime I open it, unless I open in safe mode."

  
https://crash-stats.mozilla.com/report/index/010be177-7e91-446d-b823-845442120813
 :
  "Just starting gives me a crash"

  https://crash-
  stats.mozilla.com/report/index/3b04c9ab-0884-4205-a301-ca4132120811 :
  "Again I just start Firefox and it does not stay for one second,
  before he kill himself..."

  
https://crash-stats.mozilla.com/report/index/c8ee0432-befe-427e-bdad-c67b62120811
 :
  "This happened at startup. The firefox window didn't ever appear yet."

  
https://crash-stats.mozilla.com/report/index/8d608496-2b03-48c8-822e-1b5762120808
 :
  "I think it is problem with any extension and the fucking menu of Ubuntu."

  
https://crash-stats.mozilla.com/report/index/febca548-7260-4ded-a5ee-7ba172120810
 :
  "I just started this crap browser..."

  
https://crash-stats.mozilla.com/report/index/50ff5801-0660-4172-bd96-5d8542120810
 :
  "Fucking cock, firefox sucks as usual."

  
https://crash-stats.mozilla.com/report/index/feb0791f-98e9-484c-a74b-074a32120810
 :
  "It's like an endless loop of shit.

  
https://crash-stats.mozilla.com/report/index/7eaf6c36-1479-44cf-8b1c-7924a2120810
 :
  "now it's enaugh!! fuck firefox - i take google chrome "

  
https://crash-stats.mozilla.com/report/index/bf6a81cc-ca2b-4399-9fdf-5cae82120812
 :
  "it's now not opening."

  [Test case]
  - Update Firefox, perform whatever steps were necessary to trigger the crash 
before (this could be opening the HUD, opening the menus, switching focus to 
Firefox or just starting it - this really depends on which way the wind is 
blowing) and verify it doesn't crash

  [Regression Potential]
  - None, it's just a null pointer check and another small change to ensure 
that menus are disposed of fully to avoid leaving duplicated (and orphaned) 
entries in the Firebug menu

  ProblemType: BugDistroRelease: Ubuntu 12.04
  Package: firefox 15.0~b2+build1-0ubuntu0.12.04.1~mfn1
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
  Uname: Linux 3.2.0-27-generic x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  aquarius   2505 F.... pulseaudio
  BuildID: 20120726160848
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf7e00000 irq 49'
     Mixer name : 'Intel CougarPoint HDMI'
     Components : 'HDA:14f1506e,17aa5003,00100000 
HDA:80862805,17aa5003,00100000'
     Controls      : 25
     Simple ctrls  : 12
  Channel: Unavailable
  CheckboxSubmission: 4d186c1dd89d3ba4cb89f5ee55713686
  CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
  Date: Fri Aug 10 14:13:22 2012
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20111211)
  IpRoute:
   default via 192.168.1.1 dev wlan0  proto static
   10.0.3.0/24 dev lxcbr0  proto kernel  scope link  src 10.0.3.1
   169.254.0.0/16 dev wlan0  scope link  metric 1000
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.153  
metric 2
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
  MostRecentCrashID: bp-dbbaef36-287e-4e2b-85bd-4ef8e2120810
  PrefErrors: Unexpected character 'g' before close parenthesis @ 
[Profile]/extensions/{e4a8a97b-f2ed-450b-b12d-ee082ba24781}/defaults/preferences/greasemonkey.js:4
  PrefSources: prefs.js
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=15.0/20120726160848 (In use)
  RelatedPackageVersions:
   google-talkplugin 3.2.4.0-1
   rhythmbox-mozilla 2.96-0ubuntu4.1
   totem-mozilla     3.0.1-0ubuntu21
  RunningIncompatibleAddons: FalseSourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/21/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 56CN38WW
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: U300s
  dmi.board.vendor: LENOVO
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad U300s
  dmi.modalias: 
dmi:bvnLENOVO:bvr56CN38WW:bd11/21/2011:svnLENOVO:pn1080:pvrLenovoIdeaPadU300s:rvnLENOVO:rnU300s:rvr1.0:cvnLENOVO:ct10:cvrLenovoIdeaPadU300s:
  dmi.product.name: 1080
  dmi.product.version: Lenovo IdeaPad U300s
  dmi.sys.vendor: LENOVO

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