je n'arrive pas à supprimer des marque- pages

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je n'arrive pas à supprimer des marque-pages ....Pouvez vous m'indiquer comment y remédier Merci

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: firefox 13.0+build1-0ubuntu0.11.10.1
ProcVersionSignature: Ubuntu 3.0.0-20.34-generic 3.0.30
Uname: Linux 3.0.0-20-generic i686
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mario 1204 F.... pulseaudio
 /dev/snd/controlC1: mario 1204 F.... pulseaudio
BuildID: 20120601173958
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Card0.Amixer.info:
 Card hw:0 'ICH5'/'Intel ICH5 with AD1985 at irq 17'
   Mixer name : 'Analog Devices AD1985'
   Components : 'AC97a:41445375'
   Controls : 50
   Simple ctrls : 35
Card1.Amixer.info:
 Card hw:1 'CA0106'/'Live! 7.1 24bit [SB0410] at 0xdf80 irq 20'
   Mixer name : 'CA0106'
   Components : ''
   Controls : 30
   Simple ctrls : 18
Channel: release
CurrentDmesg: [ 2822.974165] sr1: CDROM not ready. Make sure there is a disc in the drive.
Date: Tue Jun 19 22:16:53 2012
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
IpRoute:
 default via 88.125.37.254 dev eth1 proto static
 88.125.37.0/24 dev eth1 proto kernel scope link src 88.125.37.154 metric 1
 169.254.0.0/16 dev eth1 scope link metric 1000
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.

 eth1 no wireless extensions.
MostRecentCrashID: bp-9dd3fb9c-a126-41ac-b0a1-6c2fd2120617
Profiles: Profile0 (Default) - LastVersion=13.0/20120601173958 (In use)
RelatedPackageVersions:
 icedtea-plugin 1.1.3-1ubuntu1.1
 totem-mozilla 3.0.1-0ubuntu7.1
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-9dd3fb9c-a126-41ac-b0a1-6c2fd2120617
 bp-549b942d-4aef-46a3-8b30-d68a62120611
 bp-ade273d8-f12a-4705-9283-3ebe62120521
 bp-b948a9e4-935c-4a63-b0a3-c80f32120406
UpgradeStatus: Upgraded to oneiric on 2012-04-30 (49 days ago)
dmi.bios.date: 02/17/2005
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080009
dmi.board.name: P4P800SE
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: Rev 2.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080009:bd02/17/2005:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerInc.:rnP4P800SE:rvrRev2.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer