16.04 64-bit & 51.0a2 (2016-10-04) (64-bit)

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https://bugs.launchpad.net/bugs/1405874

Title:
  firefox plugin-container is using too many CPU cycles

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  
  Quick fix: Don't leave Firefox running when not in use.

  
  Reboot
  sign in and start Firefox
  goto youtube.com and watch any video
  start xterm(1) run top(1) you will always see plugin-container near or at top
  or
  let system sit for a while or overnight
  # ps -ef | less
  look at the "TIME" field
  or you could use
  # ps -ef | sort -t: -nr -k3 | head -1
  to see it sorted  by TIME field
  and for me this is returned:

  dan      17148 15252 27 13:36 ?        00:59:04 /usr/lib/firefox
  /plugin-container /usr/lib/flashplugin-installer/libflashplayer.so
  -greomni /usr/lib/firefox/omni.ja -appomni
  /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser
  15252 true plugin

  And this program far out strips all other programs using CPU TIME,
  also it is causing a slight load.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 34.0+build2-0ubuntu0.14.04.1
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dan        2144 F.... pulseaudio
   /dev/snd/controlC0:  dan        2144 F.... pulseaudio
  BrokenPermissions: oldbookmarks.html (0o555)
  BuildID: 20141127111021
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Fri Dec 26 16:51:32 2014
  ExecutablePath: /usr/lib/firefox/firefox
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   English (South Africa) Language Pack - langpack-en...@firefox.mozilla.org
   English (GB) Language Pack - langpack-en...@firefox.mozilla.org
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2013-02-06 (687 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.101  metric 
1
  MostRecentCrashID: bp-b4658248-1bb9-4d26-aae3-b30b32120831
  PrefSources:
   prefs.js
   
[Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=34.0/20141127111021 (In use)
  RelatedPackageVersions:
   google-talkplugin 5.38.6.0-1
   rhythmbox-mozilla 3.0.2-0ubuntu2
   icedtea-7-plugin  1.5-1ubuntu1
   totem-mozilla     3.10.1-1ubuntu4
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  SubmittedCrashIDs:
   bp-b4658248-1bb9-4d26-aae3-b30b32120831
   bp-9d53e8ed-16bc-4544-8c81-a0e922120831
  UpgradeStatus: Upgraded to trusty on 2014-04-24 (246 days ago)
  dmi.bios.date: 04/25/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.90
  dmi.board.name: X58 Extreme
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.90:bd04/25/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX58Extreme:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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