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

** Changed in: firefox (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1168025

Title:
  Firefox is blocked by JS GC Helper

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  Firefox sometimes freezes and turns gray when the process "JS GC
  Helper" is active. This is not a temporary freeze, but blocks Firefox
  completely until you close it.

  There are two ways you could force quit Firefox:
  1. By killing "firefox" in the system monitor, "JS GC Helper" won't be 
killed, and upon restart Firefox will tell that another instance is running 
(because its lock file hasn't yet released).
  2. By killing "JS GC Helper", firefox closes also and you can restart it.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: firefox 20.0+build1-0ubuntu0.12.10.3
  ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
  Uname: Linux 3.5.0-27-generic i686
  AddonCompatCheckDisabled: False
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andreas    2412 F.... pulseaudio
  BuildID: 20130329030414
  CRDA:
   country DE:
        (2400 - 2483 @ 40), (N/A, 20)
        (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
        (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS
        (5470 - 5725 @ 40), (N/A, 26), DFS
  Channel: Unavailable
  Date: Thu Apr 11 18:01:02 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 131.246.39.254 dev wlan0  proto static 
   131.246.32.0/21 dev wlan0  proto kernel  scope link  src 131.246.38.154  
metric 9 
   169.254.0.0/16 dev wlan0  scope link  metric 1000
  MarkForUpload: True
  MostRecentCrashID: bp-b81166f7-08ae-49e2-a097-e19d72130411
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=20.0/20130329030414
  RelatedPackageVersions: rhythmbox-mozilla 2.97-1ubuntu6.1
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2006
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: Q3B21
  dmi.board.name: PRO600IW
  dmi.board.vendor: MAXDATA
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrQ3B21:bd08/25/2006:svnMAXDATA:pnPRO600IW:pvr5123660003:rvnMAXDATA:rnPRO600IW:rvrNotApplicable:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: PRO600IW
  dmi.product.version: 5123660003
  dmi.sys.vendor: MAXDATA

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