I can report that the XPI provided (with firefox 12 beta) displays the same 
bug. The only (subtle) difference is that now it also displays this warning on 
the console:
 (firefox:14531): LIBDBUSMENU-GTK-CRITICAL **: 
dbusmenu_menuitem_property_set_shortcut: assertion `gtk_accelerator_valid(key, 
modifier)' failed

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https://bugs.launchpad.net/bugs/964584

Title:
  Firefox hangs temporarily everytimes it receives the focus

Status in “firefox” package in Ubuntu:
  Incomplete

Bug description:
  In 12.04 beta, with unity, every times firefox gets the focus, it
  blocks for a couple of seconds (~10 second on my laptop) while loading
  all the processors fully.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: firefox 11.0+build1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  piel       1633 F.... pulseaudio
  BuildID: 20120313141247
  Channel: release
  Date: Sun Mar 25 16:44:54 2012
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  Profiles: Profile0 (Default) - LastVersion=11.0/20120313141247 (Running)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/22/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68MSP Ver. F.10
  dmi.board.name: 30C9
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 75.28
  dmi.chassis.asset.tag: CZC8031BZF
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68MSPVer.F.10:bd04/22/2011:svnHewlett-Packard:pnHPCompaq2510p:pvrF.10:rvnHewlett-Packard:rn30C9:rvrKBCVersion75.28:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 2510p
  dmi.product.version: F.10
  dmi.sys.vendor: Hewlett-Packard

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