can't update or install addons in firefox 11.0

 trying to install or update add-ons results in " firefox cannot modify needed file" error in firefox 11.0
  also lost ability to grab and move files in bookmarks.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: firefox 11.0+build1-0ubuntu0.10.10.2
ProcVersionSignature: Ubuntu 2.6.35-32.67-generic 2.6.35.14
Uname: Linux 2.6.35-32-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: SI7012 [SiS SI7012], device 0: Intel ICH [SiS SI7012]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/by-path', '/dev/snd/by-id', '/dev/snd/controlC1', '/dev/snd/pcmC1D0c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
BuildID: 20120310193444
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SI7012'/'SiS SI7012 with ALC200,200P at irq 21'
   Mixer name : 'Realtek ALC200,200P rev 0'
   Components : 'AC97a:414c4710'
   Controls : 37
   Simple ctrls : 23
Card1.Amixer.info:
 Card hw:1 'Camera'/'Camera at usb-0000:00:02.2-1, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0850'
   Controls : 3
   Simple ctrls : 2
Channel: release
Date: Mon Apr 2 07:33:43 2012
EtcFirefoxSyspref: Cannot parse /etc/firefox/syspref.js - [Errno 2] No such file or directory: '/etc/firefox/syspref.js'
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: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
IpRoute:
 24.72.48.0/24 dev eth0 proto kernel scope link src 24.72.48.114 metric 1
 169.254.0.0/16 dev eth0 scope link metric 1000
 default via 24.72.48.1 dev eth0 proto static
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=11.0/20120310193444 (Running)
RfKill:

RunningIncompatibleAddons: True
SourcePackage: firefox
dmi.bios.date: 05/03/2002
dmi.bios.vendor: Award Software, Inc.
dmi.bios.version: ASUS P4S333-M ACPI BIOS Revision 1006
dmi.board.name: P4S333-M
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: REV 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 7
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAwardSoftware,Inc.:bvrASUSP4S333-MACPIBIOSRevision1006:bd05/03/2002:svnSystemManufacturer:pnSystemName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP4S333-M:rvrREV1.xx:cvnChassisManufacture:ct7:cvrChassisVersion:
dmi.product.name: System Name
dmi.product.version: System Version
dmi.sys.vendor: System Manufacturer