firefox 11.0 lento

[Vagton A F]

firefox 11.0 demora muito a carregar a primeira página de busca, no crome tudo ok

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox 11.0+build1-0ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.38-13.57-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1767 F.... pulseaudio
BuildID: 20120310010757
CRDA: Error: [Errno 2] Arquivo ou diretório não encontrado
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdfdfc000 irq 43'
   Mixer name : 'Analog Devices AD1984A'
   Components : 'HDA:11d4194a,10280294,00100400'
   Controls : 35
   Simple ctrls : 21
Channel: release
Date: Thu Apr 5 18:16:01 2012
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Ubuntu Firefox Modifications - <email address hidden>, Version=0.9.4, minVersion=4.0b6, maxVersion=10.*, Location=app-system-share, Type=extension, Active=Yes
InstallationMedia: Custom Live CD - Release i386
IpRoute:
 192.168.1.0/24 dev eth3 proto kernel scope link src 192.168.1.7 metric 1
 10.21.200.0/22 dev eth3 proto kernel scope link src 10.21.202.211
 169.254.0.0/16 dev eth3 scope link metric 1000
 default via 10.21.200.1 dev eth3 proto static
IwConfig:
 lo no wireless extensions.

 eth3 no wireless extensions.
ProcEnviron:
 LANGUAGE=pt_BR:en
 PATH=(custom, user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=11.0/20120310010757 (Running)
RfKill:

RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/02/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0Y644J
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA02:bd07/02/2009:svnDellInc.:pnOptiPlex360:pvr:rvnDellInc.:rn0Y644J:rvrA02:cvnDellInc.:ct3:cvr:
dmi.product.name: OptiPlex 360
dmi.sys.vendor: Dell Inc.
ftp_proxy: ftp://10.21.7.9:83/
http_proxy: http://10.21.7.9:83/

[dino99 (9d9)]

This version is no more supported and is not a 'security' problem; so does not expect a backport