I worked around this problem by wiping my firefox profile completely.
Safe mode did not help, only completely wiping the profile.

** Changed in: firefox (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1320450

Title:
  page up/page down/home/end don't work properly in firefox 29

Status in “firefox” package in Ubuntu:
  Invalid

Bug description:
  To reproduce:

  1. Go to youtube.com (logged in or not, doesn't matter.)
  2. Press page down: nothing happens.
  3. Click the grey background of the page.
  3. Press page down: you go instantly to the bottom of the page.
  4. Press page up a few times: you are stuck at the bottom.
  5. Press home/end: they don't work at all.

  This bug is not only limited to youtube.com, it happens on many
  websites.

  It is not something that I ever noticed with Firefox 28 and earlier.

  I have reproduced the bug in safe mode.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 29.0+build1-0ubuntu0.14.04.2
  ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
  Uname: Linux 3.13.0-8-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  al         2261 F.... pulseaudio
   /dev/snd/controlC1:  al         2261 F.... pulseaudio
   /dev/snd/controlC0:  al         2261 F.... pulseaudio
  BuildID: 20140428193813
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Sat May 17 10:17:07 2014
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   English (GB) Language Pack - langpack-en...@firefox.mozilla.org
   English (South Africa) Language Pack - langpack-en...@firefox.mozilla.org
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2014-02-11 (94 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140210)
  IpRoute:
   default via 192.168.0.1 dev eth0  proto static 
   192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.5  metric 1
  MostRecentCrashID: bp-7358c5d0-44ec-414f-98ab-e1cb92131216
  PrefSources:
   prefs.js
   
[Profile]/extensions/{3d7eb24f-2740-49df-8937-200b1cc08f8a}/defaults/preferences/flashblock.js
  Profiles: Profile0 (Default) - LastVersion=29.0/20140428193813
  RelatedPackageVersions:
   rhythmbox-mozilla 3.0.2-0ubuntu2
   totem-mozilla     3.10.1-1ubuntu4
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/25/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0704
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A79XTD EVO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0X
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0704:bd11/25/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A79XTDEVO:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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