Sorting out my concern:

1. Many people still want this in these days?
2. If it's not enabled in default settings, how many people would use (realize) 
this feature?
3. If it doesn't swap DOM wheel event's delta values, users won't scroll custom 
scrollable elements implemented with JS horizontally.
4. If it's enabled in default settings, web applications NEVER receive raw 
delta values with Shift key or other modifier. It's very bad thing for web 
application developers. E.g., game developers.
5. Swapping delta value may be broken easy at maintaining nsEventStateManager. 
For preventing it, we need a lot of automated tests as far as possible.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1228250

Title:
  [Shift + Mouse-Scroll-Wheel] Does NOT Scroll Horizontally

Status in The Mozilla Firefox Browser:
  In Progress
Status in “firefox” package in Ubuntu:
  New

Bug description:
  In Chromium, I can scroll horizontally using my mouse-wheel by holding
  down the shift key while scrolling the mouse wheel.

  Firefox is missing this very convenient page-navigation short-cut.

  
  Use Case:

  As my eyes age, I find myself always scaling up the web pages I read
  (by holding down crtl and scrolling my mouse wheel).

  Doing this, often makes the page exceed the width of my monitor
  (hiding the right-side of the text I want to read) and produces a
  horizontal scroll bar at the bottom of the page.

  At this point, since I've already used ctrl-scroll-mouse-wheel to
  magnify the page, it would be wonderful if I could use shift-scroll-
  mouse-wheel to horizontally-scroll the magnified page and therefore
  center the (previously cropped) text that I am wanting to read.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: firefox 24.0+build1-0ubuntu0.13.04.1
  ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
  Uname: Linux 3.8.0-30-generic x86_64
  NonfreeKernelModules: wl
  AddonCompatCheckDisabled: False
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lonnie     2161 F.... pulseaudio
   /dev/snd/pcmC0D0p:   lonnie     2161 F...m pulseaudio
  BrokenPermissions: sessionstore.bak (0o600, wrong owner)
  BuildID: 20130911155223
  Channel: Unavailable
  Date: Fri Sep 20 11:02:07 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2013-09-06 (14 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IpRoute:
   default via 192.168.24.1 dev eth0  proto static 
   192.168.24.0/24 dev eth0  proto kernel  scope link  src 192.168.24.198  
metric 1
  MarkForUpload: True
  PrefSources:
   prefs.js
   
[Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=24.0/20130911155223 (In use)
  RelatedPackageVersions:
   google-talkplugin 4.5.3.0-1
   icedtea-7-plugin  1.3.2-1ubuntu1.1
   totem-mozilla     3.6.3-0ubuntu6
   rhythmbox-mozilla 2.98-0ubuntu5
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/14/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0P792H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A09
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd04/14/2011:svnDellInc.:pnStudio1737:pvrA09:rvnDellInc.:rn0P792H:rvrA09:cvnDellInc.:ct8:cvrA09:
  dmi.product.name: Studio 1737
  dmi.product.version: A09
  dmi.sys.vendor: Dell Inc.

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