[Bug 933419] [NEW] Firefox sometimes renders text incorrectly

[Arunas]

Public bug reported:

Sometimes Firefox renders text incorrectly. For example, occasionally
one of the titles in Google search results is rendered differently than
the rest. Text rendering returns to normal after scrolling a page,
selecting and deselecting a text, or minimizing and restoring the
window.

Example of the bug: http://i44.tinypic.com/qo7ewk.png

The problem happens with both stable Firefox version and Aurora builds.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: firefox 12.0~a2~hg20120216r87198-0ubuntu1~umd1~oneiric
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  cato       1541 F.... xfce4-volumed
                      cato       1588 F.... xfce4-mixer-plu
BuildID: 20120216042529
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xdfef8000 irq 22'
   Mixer name	: 'Analog Devices AD1988'
   Components	: 'HDA:11d41988,10438241,00100400'
   Controls      : 37
   Simple ctrls  : 22
Channel: aurora
Date: Thu Feb 16 14:09:19 2012
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
IncompatibleExtensions:
 Ubuntu Firefox Modifications - ID=ubufox at ubuntu.com, Version=1.0.2, minVersion=4.0b6, maxVersion=10.*, Location=app-global, Type=extension, Active=Yes
 Test Pilot - ID=testpilot at labs.mozilla.com, Version=1.2, minVersion=3.5, maxVersion=10.*, Location=app-profile, Type=extension, Active=Yes
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
IpRoute:
 default via 78.58.63.254 dev eth0  proto static 
 78.58.0.0/18 dev eth0  proto kernel  scope link  src 78.58.49.180  metric 1 
 169.254.0.0/16 dev eth0  scope link  metric 1000
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
PciNetwork:
 
Plugins: Shockwave Flash - Lib=libflashplayer.so, Location=/usr/lib/flashplugin-installer
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=12.0a2/20120216042529 (Running)
PulseSinks: Error: command ['pacmd', 'list-sinks'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
PulseSources: Error: command ['pacmd', 'list-sources'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RfKill:
 
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/28/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0702
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0702:bd05/28/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: apport-bug aurora-channel i386 oneiric

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Title:
  Firefox sometimes renders text incorrectly

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