Firefox builtin PDF viewer displays some docs incorrectly

[Holger Marzen]

With this update something broke in Firefox' internal PDF-viewer. Some documents are not displayed correctly. Wrong vertical alignment, parts of text not displayed, on some docs lines are aligned at the top of the characters instead of at the bottom.

A sample of an incorrectly displayed document is http://www.detebe.org/usenet-buch/docs/Newsgroups-Buch.pdf
Page 7: content directory with extremely large vertical space
Nearly everywhere: continuous text missing

Maybe the bug affects only Postscript Type 1 fonts.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: firefox 20.0+build1-0ubuntu0.12.04.3
ProcVersionSignature: Ubuntu 3.2.0-33.52-generic 3.2.31
Uname: Linux 3.2.37 x86_64
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
BuildID: 20130329030832
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xfe700000 irq 50'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:10ec0892,19da0000,00100302 HDA:80862805,80862805,00100000'
   Controls : 59
   Simple ctrls : 23
Card1.Amixer.info:
 Card hw:1 'Q49'/'Alesis Q49 at usb-0000:04:00.0-1.3.2, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB13b2:0063'
   Controls : 0
   Simple ctrls : 0
Card1.Amixer.values:

Card2.Amixer.info:
 Card hw:2 'U0x46d0x809'/'USB Device 0x46d:0x809 at usb-0000:00:1d.0-1.6, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0809'
   Controls : 2
   Simple ctrls : 1
Card2.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 17
   Mono: Capture 12 [71%] [23.64dB] [on]
Card3.Amixer.info:
 Card hw:3 'USB'/'Focusrite Scarlett 2i2 USB at usb-0000:00:1a.0-1.2, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB1235:8006'
   Controls : 0
   Simple ctrls : 0
Card3.Amixer.values:

Channel: Unavailable
Date: Fri Apr 5 19:13:30 2013
ForcedLayersAccel: False
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
MarkForUpload: True
Plugins:
 Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
 IcedTea-Web Plugin (using IcedTea-Web 1.2 (1.2-2ubuntu1.3)) - /usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so (icedtea-6-plugin)
PrefSources: prefs.js
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=20.0/20130329030832 (In use)
RelatedPackageVersions:
 adobe-flashplugin 11.2.202.275-0precise1
 icedtea-6-plugin 1.2-2ubuntu1.3
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to precise on 2012-11-22 (134 days ago)
dmi.bios.date: 06/10/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.name: H67
dmi.board.vendor: ZOTAC
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd06/10/2011:svn:pn:pvr:rvnZOTAC:rnH67:rvr:cvn:ct3:cvr: