Public bug reported:

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.

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


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1723840

Title:
  Firefox 56.0 High CPU

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