Public bug reported:

Since the update to firefox 20.0 which came with ubuntu 13.04 my firefox
freezes the entire desktop occassionally. Usually this lasts for 10-20
seconds until everything works normal again. In case a youtube video is
playing in one of the tabs the audio continues for about 5s and then
stops also. When I have top running in a terminal I can see that CPU
usage for firefox goes up a lot.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: firefox 20.0+build1-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  jens       2132 F.... pulseaudio
BuildID: 20130417085609
Channel: Unavailable
Date: Tue May  7 17:47:09 2013
EcryptfsInUse: Yes
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2012-08-13 (266 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
IpRoute:
 default via 192.168.2.1 dev wlan0  proto static 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 192.168.2.0/24 dev wlan0  proto kernel  scope link  src 192.168.2.100  metric 9
MarkForUpload: True
MostRecentCrashID: bp-1d1c4004-5dc0-40a5-a6c1-51cc32121030
Plugins:
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
 Shockwave Flash - [HomeDir]/.mozilla/plugins/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=20.0/20130417085609 (In use)
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to raring on 2013-04-27 (10 days ago)
dmi.bios.date: 11/19/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7YET79WW (3.09 )
dmi.board.name: 2731A11
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr7YET79WW(3.09):bd11/19/2009:svnLENOVO:pn2731A11:pvrThinkPadR500:rvnLENOVO:rn2731A11:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2731A11
dmi.product.version: ThinkPad R500
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1177439

Title:
  Firefox freezes temporarily

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