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[caprico <1318403@xxxxxxxxxxxxxxxxxx>]

I can confirm that. Still happens with Ubuntu 15.10 and Firefox 41.0. I needed a long time to find out that Firefox causes it.
Deleting .mozilla folder and disabling add-ons doesn't help. Whenever I use for example Midore and keep Firefox closed, no crashes happen. 

I don't have Adobe Flash installed and only use bcmwl-kernel-source as proprietary driver (graphics are Intel HD). 
Unfortunately I have to use the power button to reboot the frozen system and don't have any error logs. Caps Lock button is not blinking (which usually is an indication of kernel panic).

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https://bugs.launchpad.net/bugs/1318403

Title:
  Firefox continuously freezes and freezes the rest of the system
  (Ubuntu 14.04)

Status in firefox package in Ubuntu:
  Confirmed
Status in mozillateam-ppa package in Ubuntu:
  Confirmed

Bug description:
  Important Update: The problem is solved when I erased .mozilla folder
  (locate in /home) and reopen firefox to recreate the folder
  '.mozilla'. Maybe a corrupt file or bad writing.

  Problem:
  Without opening Firefox, the computer works perfectly, but when you open and use Firefox starts the first freeze, and the whole system starts to become extremely slow. If I try to close Firefox and reopen it back, says there is an open process that I must close. In "No Add-ons mode" the same problem happens.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 30.0~b2+build1-0ubuntu0.14.04.2
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  juan       2032 F.... pulseaudio
   /dev/snd/controlC0:  juan       2032 F.... pulseaudio
  BuildID: 20140508142553
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Sun May 11 16:14:11 2014
  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 2014-04-18 (22 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IpRoute:
   default via 192.168.0.1 dev eth0  proto static
   192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.100  metric 1
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  Locales: extensions.sqlite corrupt or missing
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=30.0/20140508142553 (In use)
  RelatedPackageVersions:
   rhythmbox-mozilla 3.0.2-0ubuntu2
   totem-mozilla     3.10.1-1ubuntu4
  RfKill:

  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/21/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.20
  dmi.board.name: H61M-VS
  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.:bvrP1.20:bd06/21/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH61M-VS: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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