Public bug reported:

Using Radeon HD 7950 with fglrx on a 1920x1200 screen. Firefox normally
works, but sometimes when a window is launched it immediately locks up
the entire interface. You cannot switch to another tty session after it
has hung.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: firefox 20.0+build1-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
NonfreeKernelModules: fglrx
AddonCompatCheckDisabled: False
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC3:  mmstick    2314 F.... pulseaudio
 /dev/snd/controlC2:  mmstick    2314 F.... pulseaudio
 /dev/snd/controlC1:  mmstick    2314 F.... pulseaudio
 /dev/snd/controlC0:  mmstick    2314 F.... pulseaudio
BuildID: 20130404201520
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Channel: Unavailable
Date: Wed Apr 10 20:17:34 2013
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-04-07 (3 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1)
IpRoute:
 default via 192.168.1.1 dev eth0  proto static 
 169.254.0.0/16 dev eth0  scope link  metric 1000 
 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.50  metric 1
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
MarkForUpload: True
PrefSources: prefs.js
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=20.0/20130404201520
RelatedPackageVersions:
 rhythmbox-mozilla 2.98-0ubuntu5
 totem-mozilla     3.6.3-0ubuntu4
RfKill:
 
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/12/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1102
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH 990FX
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1102:bd03/12/2012:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTH990FX:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.

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


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1167656

Title:
  Firefox Hangs System

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