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[Launchpad Bug Tracker <1524912@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/1524912

Title:
  Constant high CPU since version 42 update

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Firefox is slow to respond and showing >100% CPU In top/atop since the
  update to 42. Can be reproduced on two machines, an Acer Revo RL80
  with dual core Celeron 1.50Ghz, and an Asus S400CA laptop with quad
  cord i7 at 1.90Ghz. The Revo is running 15.10 and the Asus 15.04,
  currently being upgraded. Both were working fine until the last couple
  of days.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: firefox 42.0+build2-0ubuntu0.15.10.1
  ProcVersionSignature: Ubuntu 4.2.0-18.22-lowlatency 4.2.3
  Uname: Linux 4.2.0-18-lowlatency x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  simong     2367 F.... pulseaudio
   /dev/snd/controlC0:  simong     2367 F.... pulseaudio
  BrokenPermissions: stylishsync (0o400)
  BuildID: 20151030083518
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Dec 10 16:43:27 2015
  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 2014-12-18 (357 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static  metric 100 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.68  metric 100 
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
  Locales: extensions.sqlite corrupt or missing
  MostRecentCrashID: bp-f26990dc-8766-4797-bc7d-9522b2151117
  Plugins:
   IcedTea-Web Plugin (using IcedTea-Web 1.5.3 (1.5.3-0ubuntu0.15.10.1)) - /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so (icedtea-7-plugin)
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
  PrefSources:
   prefs.js
   [Profile]/extensions/support@xxxxxxxxxxxx/defaults/preferences/defaults.js
   [Profile]/extensions/https-everywhere@xxxxxxx/defaults/preferences/preferences.js
   [Profile]/extensions/fvdmedia@xxxxxxxxx/defaults/preferences/fvd.js
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=42.0/20151030083518 (In use)
  RelatedPackageVersions: icedtea-7-plugin 1.5.3-0ubuntu0.15.10.1
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs: bp-f26990dc-8766-4797-bc7d-9522b2151117
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to wily on 2015-11-30 (10 days ago)

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