firefox unacceptably slow

[Humphrey van Polanen Petel]

firefox version 55.0.1
slow in loading pages
slow in responding to input
window darkens repeatedly
xorg uses 15% cpu

I will use chromium until this has been fixed

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 55.0.1+build2-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: humphrey 2246 F.... pulseaudio
 /dev/snd/controlC1: humphrey 2246 F.... pulseaudio
BuildID: 20170814194055
Channel: Unavailable
CurrentDesktop: Unity
Date: Thu Aug 17 10:46:50 2017
ExecutablePath: /usr/lib/firefox/firefox
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 2017-07-27 (20 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IpRoute:
 default via 192.168.0.1 dev enp4s0 proto static metric 100
 169.254.0.0/16 dev enp4s0 scope link metric 1000
 192.168.0.0/24 dev enp4s0 proto kernel scope link src 192.168.0.101 metric 100
IwConfig:
 lo no wireless extensions.

 enp4s0 no wireless extensions.
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-75100bdc-c718-4fb8-a6e4-03b672170204
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=55.0.1/20170814194055 (In use)
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/22/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.0
dmi.board.name: 0N185P
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.0:bd06/22/2010:svnDellInc.:pnVostro420Series:pvr:rvnDellInc.:rn0N185P:rvrA02:cvnDellInc.:ct3:cvr:
dmi.product.name: Vostro 420 Series
dmi.sys.vendor: Dell Inc.

[reereeboy (reereeboy)]

same here, 2 computers with linux mint and firefox 55.0.1

[Paul White (paulw2u)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. It would help us a lot if you could test it on a currently supported Ubuntu version.

When you test it and it is still an issue, kindly upload the updated logs by running only once:

apport-collect 1711261

and any other logs that are relevant for this particular issue.

[Humphrey van Polanen Petel (hpvpp)]

No longer a problem.

Can be closed.

I would change the status to something appropriate if it were there.

[Paul White (paulw2u)]

Thanks for your reply. Closing as "Invalid" as cause of issue never confirmed.