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[Gustaf Granath <gustaf.granath@xxxxxxxxx>]

Experiencing this problem as well. Ubuntu 14.04.1, firefox 35.0.1.

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https://bugs.launchpad.net/bugs/1278391

Title:
  Very heavy CPU usage for Facebook in Firefox

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  When a tab with the Facebook home page is active in Firefox, Firefox's
  CPU usage shoots through the roof. It had been very bad for a while,
  but recently it has got worse, now sticking at almost a constant 100%
  on one core (of a 1.5GHz Core2Duo), as opposed to around 5-20% when
  the page is backgrounded or closed.

  I cannot reproduce this problem in Opera. I have also read reports on
  forums that say this problem does not occur in Chrome.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: firefox 26.0+build2-0ubuntu0.13.10.2
  ProcVersionSignature: Ubuntu 3.11.0-15.8-lowlatency 3.11.10
  Uname: Linux 3.11.0-15-lowlatency x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  BuildID: 20131206145143
  Channel: Unavailable
  Date: Mon Feb 10 11:44:41 2014
  EcryptfsInUse: Yes
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2013-08-22 (171 days ago)
  InstallationMedia: Ubuntu-Studio 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.100  metric 1
  Locales: extensions.sqlite corrupt or missing
  MarkForUpload: True
  Profiles: Profile0 (Default) - LastVersion=26.0/20131206145143 (In use)
  RelatedPackageVersions:
   gnome-shell        3.8.4-0ubuntu5
   browser-plugin-vlc 2.0.6-2
   totem-mozilla      3.8.2-0ubuntu1
   rhythmbox-mozilla  2.99.1-0ubuntu1
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to saucy on 2013-10-20 (112 days ago)
  WifiSyslog: Feb 10 11:41:32 ermintrude kernel: [370333.201415] usb 2-1.3: USB disconnect, device number 20
  dmi.bios.date: 06/28/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7OET24WW (1.03 )
  dmi.board.name: 8932A11
  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:bvr7OET24WW(1.03):bd06/28/2007:svnLENOVO:pn8932A11:pvrThinkPadR61/R61i:rvnLENOVO:rn8932A11:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 8932A11
  dmi.product.version: ThinkPad R61/R61i
  dmi.sys.vendor: LENOVO

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