Public bug reported:

After updating to Firefox 21 I experience frequent freezes with just Gmail and 
on other tab loaded + 4 not loaded.
Maybe it's because I'm upgrading a VirtualBox machine in the background, but 
upgrade started when I was using Firefox 20 and I didn't have any freezes.

stdout looks like this:

$ firefox 
WARNING: waitpid failed pid:1644365536 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: waitpid failed pid:1644365536 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: Failed to deliver SIGKILL to 1644365536!(3).: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/chrome/common/process_watcher_posix_sigchld.cc,
 line 118
WARNING: waitpid failed pid:1974158048 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: waitpid failed pid:1974158048 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: Failed to deliver SIGKILL to 1974158048!(3).: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/chrome/common/process_watcher_posix_sigchld.cc,
 line 118
WARNING: waitpid failed pid:1974804960 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: waitpid failed pid:1974804960 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: Failed to deliver SIGKILL to 1974804960!(3).: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/chrome/common/process_watcher_posix_sigchld.cc,
 line 118
WARNING: waitpid failed pid:1539970528 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: waitpid failed pid:1539970528 errno:10: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/base/process_util_posix.cc, 
line 260
WARNING: Failed to deliver SIGKILL to 1539970528!(3).: file 
/build/buildd/firefox-21.0+build2/ipc/chromium/src/chrome/common/process_watcher_posix_sigchld.cc,
 line 118

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: firefox 21.0+build2-0ubuntu0.12.04.3
ProcVersionSignature: Ubuntu 3.2.0-41.66-generic-pae 3.2.42
Uname: Linux 3.2.0-41-generic-pae i686
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  i          8721 F.... pulseaudio
 /dev/snd/controlC0:  i          8721 F.... pulseaudio
 /dev/snd/pcmC0D0p:   i          8721 F...m pulseaudio
BuildID: 20130512194440
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xfa200000 irq 52'
   Mixer name   : 'Realtek ALC892'
   Components   : 'HDA:10ec0892,14627681,00100302'
   Controls      : 44
   Simple ctrls  : 21
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfa080000 irq 17'
   Mixer name   : 'Nvidia GPU 16 HDMI/DP'
   Components   : 'HDA:10de0016,10de0101,00100100'
   Controls      : 24
   Simple ctrls  : 4
Channel: Unavailable
Date: Wed May 15 17:57:38 2013
DefaultProfileBrokenPermissions: .flagged (0644, wrong owner)
DefaultProfilePrefSources:
 prefs.js
 
[Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
 
[Profile]/extensions/{3d7eb24f-2740-49df-8937-200b1cc08f8a}/defaults/preferences/flashblock.js
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
 #auto lo
IpRoute:
 default via 192.168.0.1 dev eth0  proto static 
 10.0.3.0/24 dev lxcbr0  proto kernel  scope link  src 10.0.3.1 
 169.254.0.0/16 dev eth0  scope link  metric 1000 
 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.104  metric 1
MarkForUpload: True
MostRecentCrashID: bp-b1641176-1726-45b1-a1e3-1ade62130304
Profile1BrokenPermissions: .flagged (0644, wrong owner)
Profile1PrefSources: prefs.js
Profiles:
 Profile0 (Default) - LastVersion=21.0/20130512194440 (In use)
 Profile1 - LastVersion=19.0/20130218103407 (Out of date)
RfKill:
 
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-b1641176-1726-45b1-a1e3-1ade62130304
 bp-1a91f60a-e054-45a6-8f05-77fd42130304
 bp-b712e3bd-0b34-445d-80e3-685b62121215
 bp-ef838a78-7d08-47b2-8d40-cca242121117
 bp-2a30c0ae-6941-44a7-bde1-deffe2111012
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/02/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.9
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P67A-GD53 (MS-7681)
dmi.board.vendor: MSI
dmi.board.version: 1.0/2.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0/2.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV1.9:bd03/02/2011:svnMSI:pnMS-7681:pvr1.0/2.0:rvnMSI:rnP67A-GD53(MS-7681):rvr1.0/2.0:cvnMSI:ct3:cvr1.0/2.0:
dmi.product.name: MS-7681
dmi.product.version: 1.0/2.0
dmi.sys.vendor: MSI

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise

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https://bugs.launchpad.net/bugs/1180425

Title:
  Firefox 21 freezes frequently

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