Constant high CPU since version 42 update

Bug #1524912 reported by Simon Greenwood on 2015-12-10
This bug affects 5 people
Affects Status Importance Assigned to Milestone
firefox (Ubuntu)

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
 /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
 # 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)
 default via dev eth0 proto static metric 100 dev eth0 scope link metric 1000 dev eth0 proto kernel scope link src metric 100 dev virbr0 proto kernel scope link src
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-f26990dc-8766-4797-bc7d-9522b2151117
 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/ (icedtea-7-plugin)
 Shockwave Flash - /usr/lib/flashplugin-installer/
 [Profile]/<email address hidden>/defaults/preferences/defaults.js
 [Profile]/<email address hidden>/defaults/preferences/preferences.js
 [Profile]/<email address hidden>/defaults/preferences/fvd.js
 PATH=(custom, no user)
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)

Launchpad Janitor (janitor) wrote :

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

Changed in firefox (Ubuntu):
status: New → Confirmed
Changed in firefox (Ubuntu):
importance: Undecided → High
Paul White (paulw2u) wrote :

We are sorry that we do not always have the capacity to review all reported bugs in a timely manner. You reported this bug some time ago and there have been many changes in Ubuntu and Firefox since that time.

Ubuntu 15.10 (wily) reached end-of-life on July 28, 2016.

Do you still see a problem related to the one that you reported using currently supported versions of Ubuntu and Firefox?

See this document for currently supported Ubuntu releases:

Please let us know if you do otherwise this bug report can be left to expire in approximately 60 days time.

Thank you for helping make Ubuntu better.

Paul White
[Ubuntu Bug Squad]

Changed in firefox (Ubuntu):
status: Confirmed → Incomplete
Launchpad Janitor (janitor) wrote :

[Expired for firefox (Ubuntu) because there has been no activity for 60 days.]

Changed in firefox (Ubuntu):
status: Incomplete → Expired
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