http://open.knome.fi/2013/02/05/fuzzy-fonts-in-firefox-18-no-more/


tl;dr
In about:config, edit keys in the following way:

    Set layers.acceleration.force-enabled to true
    Set layers.acceleration.disabled to false

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https://bugs.launchpad.net/bugs/1097763

Title:
  Firefox 18 anti-aliasing does not render correctly some text

Status in “firefox” package in Ubuntu:
  Fix Committed

Bug description:
  Some portion of text are not rendering correctly after upgrading to
  Firefox 18 in Ubuntu 12.04.1 amd64. I've attached a screenshot, please
  notice the red text on the right.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: firefox 18.0+build1-0ubuntu0.12.04.3
  ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
  Uname: Linux 3.2.0-35-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu15.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  shiba      2252 F.... pulseaudio
   /dev/snd/controlC0:  shiba      2252 F.... pulseaudio
  BuildID: 20130107224849
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xfe028000 irq 22'
     Mixer name : 'Realtek ALC888'
     Components : 'HDA:10ec0888,1028020e,00100001'
     Controls      : 39
     Simple ctrls  : 19
  Card1.Amixer.info:
   Card hw:1 'NVidia_1'/'HDA NVidia at 0xfbffc000 irq 16'
     Mixer name : 'Nvidia GPU 15 HDMI/DP'
     Components : 'HDA:10de0015,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Channel: Unavailable
  Date: Wed Jan  9 14:35:43 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120309)
  IpRoute:
   default via 192.168.0.1 dev eth0  proto static
   169.254.0.0/16 dev eth0  scope link  metric 1000
   192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.102  metric 
1
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  MarkForUpload: True
  PciNetwork:

  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=18.0/20130107224849
  RfKill:

  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/15/2007
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.3
  dmi.board.name: 0RY206
  dmi.board.vendor: Dell Inc.
  dmi.board.version: ���
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.3:bd06/15/2007:svnDellInc.:pnInspiron531:pvr00:rvnDellInc.:rn0RY206:rvr:cvnDellInc.:ct3:cvrChassisVersion:
  dmi.product.name: Inspiron 531
  dmi.product.version: 00
  dmi.sys.vendor: Dell Inc.

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