[Bug 1341405] [NEW] High usage of CPU in Firefox

Sergio Benjamim sergio_br2 at yahoo.com.br
Mon Jul 14 02:59:17 UTC 2014

Public bug reported:

This website is triggering high usage in firefox:


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

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
Uname: Linux 3.13.0-30-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
 /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
 # 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)
 default via dev wlan0  proto static dev wlan0  proto kernel  scope link  src  metric 9
Locales: extensions.sqlite corrupt or missing
 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
 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)
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.

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

** Tags: amd64 apport-bug third-party-packages trusty

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