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[Launchpad Bug Tracker <1341405@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: firefox (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1341405

Title:
  High usage of CPU in Firefox

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  This website is triggering high usage in firefox:

  http://www.theguardian.com/world/2014/jul/13/israeli-troops-clash-
  with-hamas-as-gaza-death-toll-continues-to-spiral

  It's over 270% in core i7 4700 HQ.

  This website is the first that I can reproduce this problem in
  Firefox. Sometimes, with many open tabs, this problem happens, and I
  need to close and open again.

  I have only one extension enabled: Ubuntu Firefox Modifications 2.9.

  And IcedTea-Web Plugin and Shockwave Flash have the option "Ask to
  Activate".

  Firefox 30.0
  kernel 3.13.0-30-generic x86_64 (happens with 3.14.12 too).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 30.0+build1-0ubuntu0.14.04.3
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sergio     2236 F.... pulseaudio
   /dev/snd/controlC1:  sergio     2236 F.... pulseaudio
  BuildID: 20140608211622
  Channel: Unavailable
  Date: Sun Jul 13 23:43:05 2014
  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 2014-05-26 (49 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  IpRoute:
   default via 192.168.0.1 dev wlan0  proto static 
   192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.4  metric 9
  Locales: extensions.sqlite corrupt or missing
  Plugins:
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
   IcedTea-Web Plugin (using IcedTea-Web 1.5 (1.5-1ubuntu1)) - /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so (icedtea-7-plugin)
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=30.0/20140608211622
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions: icedtea-7-plugin 1.5-1ubuntu1
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 08/14/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X750JB.208
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X750JB
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX750JB.208:bd08/14/2013:svnASUSTeKCOMPUTERINC.:pnX750JB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX750JB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X750JB
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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