I've been through old versions of firefox and the last good version was
the final release of firefox 17.  I'll attach a screenshot.

** Attachment added: "Firefox 17 with good font rendering"
   
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1105328/+attachment/3522099/+files/17.0.1%2Bbuild1-0ubuntu0.12.04.1.png

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https://bugs.launchpad.net/bugs/1105328

Title:
  Firefox renders text poorly on some sites

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  Firefox has begun rendering fonts incorrectly in some situations.  I
  have noticed this mostly in Gmail and Google Docs, where red text will
  have dark pixels on the left side of characters (see attachment; left
  is Firefox, right is Chrome).  On some other websites, lightly-colored
  text will have lighter-colored pixels drawn on the left side of the
  characters.  However, the issue is not limited to red text.  Even
  black text seems rendered/smoothed poorly in Firefox compared to
  Chrome (perhaps this part is subjective).

  Oddly it also does not happen on every website.  Writing "Gmail" and
  "Inbox" in red 12pt Arial in Google Documents exhibits the problem
  seen in the attached screenshot, while writing the same text in Zoho
  Writer does not.  In Google Documents, I can actually see the text
  rendered without this problem for a moment as the page loads, but
  something gets applied during the page loading process that changes
  the rendering to its final distorted state.

  Finally, running in safe mode or using a new profile do not affect
  this problem.  I do not recall seeing this problem in versions before
  18.0, but it could have been around in later revisions of v17.  I also
  haven't been able to notice this problem in other desktop
  applications.

  Release: Ubuntu 12.10
  Package: Firefox 18.0.1+build1-0ubuntu0.12.10.1
  Expected: Fonts are drawn correctly.
  Instead: Colored fonts have incorrectly-colored features on the left side.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: firefox 18.0.1+build1-0ubuntu0.12.10.1
  ProcVersionSignature: Ubuntu 3.5.0-22.34-generic 3.5.7.2
  Uname: Linux 3.5.0-22-generic i686
  AddonCompatCheckDisabled: False
  ApportVersion: 2.6.1-0ubuntu9
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fourwood   1988 F.... pulseaudio
  BuildID: 20130116231921
  Channel: Unavailable
  Date: Fri Jan 25 11:45:31 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2011-10-16 (467 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  IpRoute:
   default via 192.168.5.1 dev eth0  proto static 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.5.0/24 dev eth0  proto kernel  scope link  src 192.168.5.165  metric 
1
  MarkForUpload: True
  MostRecentCrashID: bp-ea3fb463-f6c0-499e-b262-b35e42120312
  PrefSources:
   prefs.js
   [Profile]/extensions/twitternotif...@naan.net/defaults/preferences/pref.js
  Profiles: Profile0 (Default) - LastVersion=18.0.1/20130116231921 (In use)
  RelatedPackageVersions:
   rhythmbox-mozilla 2.97-1ubuntu6.1
   icedtea-7-plugin  1.3-1ubuntu1.1
   totem-mozilla     3.4.3-0ubuntu5
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: yes
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs: bp-ea3fb463-f6c0-499e-b262-b35e42120312
  UpgradeStatus: Upgraded to quantal on 2012-10-18 (98 days ago)
  WifiSyslog:
   
  dmi.bios.date: 10/10/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0HT027
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd10/10/2008:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0HT027:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

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