Firefox 56.0 High CPU

[js1]

Since the Firefox 56 upgrade, CPU utilization has been high during idle and light usage. Just typing this bugreport, here's a sample top:

top - 23:02:20 up 2 days, 41 min, 5 users, load average: 0.78, 0.80, 0.77
Tasks: 243 total, 2 running, 240 sleeping, 0 stopped, 1 zombie
%Cpu(s): 9.0 us, 0.5 sy, 0.0 ni, 90.0 id, 0.5 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 7130052 total, 2096428 free, 2678412 used, 2355212 buff/cache
KiB Swap: 524280 total, 524280 free, 0 used. 4027112 avail Mem

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 1895 js1 20 0 4701160 2.032g 175340 R 100.0 29.9 1086:22 firefox

Please let me know if I need to provide any additional debug or info.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 56.0+build6-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: js1 1957 F.... pulseaudio
 /dev/snd/controlC1: js1 1957 F.... pulseaudio
BuildID: 20171003101344
Channel: Unavailable
CurrentDesktop: XFCE
Date: Sun Oct 15 22:57:05 2017
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 2016-05-01 (532 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 10.23.21.1 dev wlp7s4 proto static metric 600
 10.23.21.0/26 dev wlp7s4 proto kernel scope link src 10.23.21.18 metric 600
 169.254.0.0/16 dev wlp7s4 scope link metric 1000
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-5bca9619-b74f-4910-9909-6bd1b0170925
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=56.0/20171003101344 (In use)
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/28/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.name: 0D881F
dmi.board.vendor: Dell Inc.
dmi.board.version: A05
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA16:bd05/28/2013:svnDellInc.:pnPrecisionWorkStationT7500:pvr:rvnDellInc.:rn0D881F:rvrA05:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T7500
dmi.sys.vendor: Dell Inc.

[Launchpad Janitor (janitor)]

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

[Mimmo Salomone (mimmosalomone)]

Also affected on Ubuntu 17.10

[js1 (sujiannming)]

Just realized new Firefox Electrolysis
(https://wiki.mozilla.org/Electrolysis) may not be compatible with
legacy plugins/add-ons. May have to disable the incompatible legacy
add-ons.

On Mon, Oct 30, 2017 at 4:59 PM, Mimmo Salomone <email address hidden> wrote:
> Also affected on Ubuntu 17.10
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1723840
>
> Title:
> Firefox 56.0 High CPU
>
> Status in firefox package in Ubuntu:
> Confirmed
> Status in firefox package in Arch Linux:
> New
>
> Bug description:
> Since the Firefox 56 upgrade, CPU utilization has been high during
> idle and light usage. Just typing this bugreport, here's a sample
> top:
>
> top - 23:02:20 up 2 days, 41 min, 5 users, load average: 0.78, 0.80, 0.77
> Tasks: 243 total, 2 running, 240 sleeping, 0 stopped, 1 zombie
> %Cpu(s): 9.0 us, 0.5 sy, 0.0 ni, 90.0 id, 0.5 wa, 0.0 hi, 0.0 si, 0.0 st
> KiB Mem : 7130052 total, 2096428 free, 2678412 used, 2355212 buff/cache
> KiB Swap: 524280 total, 524280 free, 0 used. 4027112 avail Mem
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 1895 js1 20 0 4701160 2.032g 175340 R 100.0 29.9 1086:22 firefox
>
>
> Please let me know if I need to provide any additional debug or info.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 16.04
> Package: firefox 56.0+build6-0ubuntu0.16.04.2
> ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
> Uname: Linux 4.4.0-97-generic x86_64
> NonfreeKernelModules: nvidia_uvm nvidia
> AddonCompatCheckDisabled: False
> ApportVersion: 2.20.1-0ubuntu2.10
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: js1 1957 F.... pulseaudio
> /dev/snd/controlC1: js1 1957 F.... pulseaudio
> BuildID: 20171003101344
> Channel: Unavailable
> CurrentDesktop: XFCE
> Date: Sun Oct 15 22:57:05 2017
> 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 2016-05-01 (532 days ago)
> InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
> IpRoute:
> default via 10.23.21.1 dev wlp7s4 proto static metric 600
> 10.23.21.0/26 dev wlp7s4 proto kernel scope link src 10.23.21.18 metric 600
> 169.254.0.0/16 dev wlp7s4 scope link metric 1000
> Locales: extensions.sqlite corrupt or missing
> MostRecentCrashID: bp-5bca9619-b74f-4910-9909-6bd1b0170925
> Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
> PrefSources: prefs.js
> Profiles: Profile0 (Default) - LastVersion=56.0/20171003101344 (In use)
> RfKill:
> 0: phy0: Wireless LAN
> Soft blocked: no
> Hard blocked: no
> RunningIncompatibleAddons: False
> SourcePackage: firefox
> Themes: extensions.sqlite corrupt or missing
> Up...