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[Pacific Seascape <1455286@xxxxxxxxxxxxxxxxxx>]

Result:

$ xdpyinfo | grep dots
resolution:    144x144 dots per inch

HiDPI support just made its way into Mozilla Thunderbird (as of version
38.2.0), and when I opened Thunderbird, the whole UI was appearing large
and distorted. But setting layout.css.devPixelsPerPx to 1.0 with the
config editor quickly put Thunderbird back to normal, same as with
Firefox.

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https://bugs.launchpad.net/bugs/1455286

Title:
  Firefox appears horribly distorted after upgrade to 38.0

Status in firefox package in Ubuntu:
  New

Bug description:
  Today when I opened my package manager (muon) to check for updates, I
  saw there was an update for Firefox, to version 38. I installed this
  along with other available updates like I always do. Upon restarting
  Firefox, however, I discovered a nasty surprise. All of Firefox's UI
  was appearing as if I was on a computer with a much lower screen
  resolution, and web pages were appearing as if I had massively zoomed
  in on them.

  Everything looks many times bigger than it should be: icons, toolbars,
  tabs, menus, web pages, they're all big.

  I have no idea how or why this happened.

  I tried restarting Firefox in safe mode, wondering if it was maybe an
  incompatible add-on. This did absolutely nothing for me. I began to
  suspect that the update to Firefox 38 had caused the problem. So I
  decided to test my theory by downgrading. The only prior version in
  the repos appeared to be 28.x, but luckily, in my
  /var/cache/apt/archives/ folder, I found the .deb for the last version
  of Firefox I had installed - 37.0.2. I opened the .deb and installed
  it. Upon opening Firefox, everything was normal again -no abnormally
  large chrome or web pages.

  I ran the upgrade to Firefox 38 again, and bingo - the problem came
  back. I ran ubuntu-bug firefox to get Apport going, and then finished
  up by coming here to Launchpad to submit a report. Attached a
  screenshot to show the distortion.

  My computer's native resolution is 1920x1080, and that's what I run.

  I'll have to stick with 37.0.2 until I get some confirmation that this
  issue with Firefox 38 has been addressed/resolved. Firefox is unusable
  with this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 38.0+build3-0ubuntu0.14.04.1
  ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-52-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  BuildID: 20150511103818
  Channel: Unavailable
  CurrentDesktop: KDE
  Date: Thu May 14 18:22:34 2015
  EcryptfsInUse: Yes
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2014-07-28 (290 days ago)
  InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static 
   172.16.240.0/24 dev vmnet8  proto kernel  scope link  src 172.16.240.1 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.21  metric 1 
   192.168.66.0/24 dev vmnet1  proto kernel  scope link  src 192.168.66.1
  Locales: extensions.sqlite corrupt or missing
  MostRecentCrashID: bp-3c820930-59fa-410c-9358-def442150515
  Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
  PrefSources:
   prefs.js
   [Profile]/extensions/{11b496ea-481a-11dc-8314-0800200c9a66}/defaults/preferences/shooter.js
   [Profile]/extensions/artur.dubovoy@xxxxxxxxx/defaults/preferences/fvd_single_setup.js
   [Profile]/extensions/https-everywhere@xxxxxxx/defaults/preferences/preferences.js
  Profiles: Profile0 (Default) - LastVersion=38.0/20150511103818 (In use)
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: yes
   	Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/23/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: E16F2IG6 V3.0R
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: MS-16F2
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Micro-Star International
  dmi.chassis.version: To be filled by O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrE16F2IG6V3.0R:bd12/23/2011:svn:pn:pvrTobefilledbyO.E.M.:rvnMicro-StarInternationalCo.,Ltd.:rnMS-16F2:rvrTobefilledbyO.E.M.:cvnMicro-StarInternational:ct10:cvrTobefilledbyO.E.M.:
  dmi.product.version: To be filled by O.E.M.

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