Public bug reported:

1) Ubuntu Artful Aardvark (development branch) 17.10
2) firefox 55.0.2+build1-0ubuntu4
3) <10% of Athlon II x2 2000
4) 45-50% of Athlon II x2 2000

I had this in Ubuntu 16.04.3 also

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: firefox 55.0.2+build1-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic x86_64
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.13.0-12-generic.
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  user       1071 F.... pulseaudio
 /dev/snd/controlC1:  user       1071 F.... pulseaudio
BuildID: 20170919185010
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
   Mixer name   : 'Realtek ALC892'
   Components   : 'HDA:10ec0892,1458a102,00100302'
   Controls      : 55
   Simple ctrls  : 22
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfdffc000 irq 19'
   Mixer name   : 'ATI RS690/780 HDMI'
   Components   : 'HDA:1002791a,00791a00,00100000'
   Controls      : 7
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined
   Playback channels: Mono
   Mono: Playback [on]
Channel: Unavailable
CurrentDesktop: LXDE
Date: Sun Oct  1 10:09:30 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 2017-09-29 (1 days ago)
InstallationMedia: Lubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
IpRoute:
 default via 192.168.1.1 dev enp2s0 proto static metric 100 
 192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.2 metric 100
IwConfig:
 enp2s0    no wireless extensions.
 
 lo        no wireless extensions.
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=55.0.2/20170919185010 (In use)
RelatedPackageVersions: adobe-flashplugin 1:20170912.1-0ubuntu1
RfKill:
 
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/11/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F8
dmi.board.name: GA-880GM-UD2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF8:bd10/11/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-880GM-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-880GM-UD2H:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-880GM-UD2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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


** Tags: amd64 apport-bug artful

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1720611

Title:
  firefox "eats" too much CPU while downloads files (not an unkown file
  size)

Status in firefox package in Ubuntu:
  New

Bug description:
  1) Ubuntu Artful Aardvark (development branch) 17.10
  2) firefox 55.0.2+build1-0ubuntu4
  3) <10% of Athlon II x2 2000
  4) 45-50% of Athlon II x2 2000

  I had this in Ubuntu 16.04.3 also

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: firefox 55.0.2+build1-0ubuntu4
  ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
  Uname: Linux 4.13.0-12-generic x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.13.0-12-generic.
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  user       1071 F.... pulseaudio
   /dev/snd/controlC1:  user       1071 F.... pulseaudio
  BuildID: 20170919185010
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
     Mixer name : 'Realtek ALC892'
     Components : 'HDA:10ec0892,1458a102,00100302'
     Controls      : 55
     Simple ctrls  : 22
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfdffc000 irq 19'
     Mixer name : 'ATI RS690/780 HDMI'
     Components : 'HDA:1002791a,00791a00,00100000'
     Controls      : 7
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined
     Playback channels: Mono
     Mono: Playback [on]
  Channel: Unavailable
  CurrentDesktop: LXDE
  Date: Sun Oct  1 10:09:30 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 2017-09-29 (1 days ago)
  InstallationMedia: Lubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  IpRoute:
   default via 192.168.1.1 dev enp2s0 proto static metric 100 
   192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.2 metric 100
  IwConfig:
   enp2s0    no wireless extensions.
   
   lo        no wireless extensions.
  Locales: extensions.sqlite corrupt or missing
  Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=55.0.2/20170919185010 (In use)
  RelatedPackageVersions: adobe-flashplugin 1:20170912.1-0ubuntu1
  RfKill:
   
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/11/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F8
  dmi.board.name: GA-880GM-UD2H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF8:bd10/11/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-880GM-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-880GM-UD2H:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-880GM-UD2H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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