Thunderbird does not support C-f, C-n, C-p, C-w of gtk-key-theme=Emacs

In composing area of new mail, Thunderbird does not honor gtk-key-theme=Emacs on some key-combinations.

DOES NOT WORK:

  C-f: <right> Move forward one character (forward-char).
    - Open search dialogue instead

  C-n: <down> Move down one screen line (next-line).
    - Open an another composing window instead

  C-p: <up> Move up one screen line (previous-line).
    - Open print dialogue instead

  C-w: <Ctrl>+<Delete> Kill region (backward-word).
    - Close the window instead

WORKS:
  C-a: <Home> Move to the beginning of the line (move-beginning-of-line).

  C-e: <End> Move to the end of the line (move-end-of-line).

  C-b: <left> Move backward one character (backward-char).

gtk-key-theme=Emacs can be set by the command:
  $ gsettings set org.gnome.desktop.interface gtk-key-theme 'Emacs'

ProblemType: BugDistroRelease: Ubuntu 11.10
Package: thunderbird 7.0.1+build1+nobinonly-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 1.23-0ubuntu3
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nobuto 1667 F.... pulseaudio
BuildID: 20110929181644
CRDA: Error: [Errno 2] そのようなファイルやディレクトリはありません
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0a00000 irq 45'
   Mixer name : 'Realtek ALC269'
   Components : 'HDA:10ec0269,10cf0000,00100004 HDA:11c11040,10cf14a5,00100200'
   Controls : 17
   Simple ctrls : 11
Channel: release
CheckboxSubmission: 1d84ca1b2de43c2199974f7b8a6ca9cb
CheckboxSystem: 0657dd966bc74d2b22e7c94051aa55af
Date: Sun Oct 16 05:14:12 2011
EcryptfsInUse: Yes
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Nightly Tester Tools - ID={8620c15f-30dc-4dba-a131-7c5d20cf4a29}, Version=3.1.5.1, minVersion=2.0, maxVersion=7.0a1, Location=app-profile, Type=extension, Active=Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20111007)
IpRoute:
 default via 192.168.11.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.11.0/24 dev wlan0 proto kernel scope link src 192.168.11.52 metric 2
Profiles: Profile0 (Default) - LastVersion=7.0.1/20110929181644 (Running)
RunningIncompatibleAddons: TrueSourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/30/2009
dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
dmi.bios.version: Version 1.22
dmi.board.name: FJNB1E6
dmi.board.vendor: FUJITSU
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU
dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.22:bd03/30/2009:svnFUJITSU:pnFMVMGD75P:pvr:rvnFUJITSU:rnFJNB1E6:rvr:cvnFUJITSU:ct10:cvr:
dmi.product.name: FMVMGD75P
dmi.sys.vendor: FUJITSU