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[madbiologist <1455286@xxxxxxxxxxxxxxxxxx>]

All I could find was an article at
http://www.omgubuntu.co.uk/2015/05/firefox-38-arrives-with-tab-based-
preferences-ruby-character-support which mentions near the end:

"Improved HiDPI on Linux, with scale now set by DPI (previously
defaulted to 1)".

They don't really explain that and it seems to conflict with your
comment that "Firefox has been set to use the system default for a long
time... since Trusty was installed on this system, actually. Prior to
version 38, -1 had the same effect as the 1.0 setting you suggested."
Perhaps that preference was actually ignored/overridden until Firefox
38?  I don't know.

I don't need to adjust the layout.css.devPixelsPerPx preference on my
system.  When I open a command prompt and type "xdpyinfo | grep dots" I
get the result "resolution:    96x96 dots per inch".  What do you get?

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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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