Firefox keeps asking to ebable add ons at every start up

[S. Patrikios]

after last firefox update it keeps asking at evert startup to re-enable add ons & themes.
Is this a bug or a feature?

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: firefox 15.0.1+build1-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sipatrik 1996 F.... pulseaudio
BuildID: 20120907073726
Channel: Unavailable
Date: Thu Sep 27 10:38:45 2012
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905.2)
IpRoute:
 default via 192.168.2.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.2.0/24 dev wlan0 proto kernel scope link src 192.168.2.9 metric 9
PrefSources:
 prefs.js
 [Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
 [Profile]/<email address hidden>/defaults/preferences/prefs.js
Profiles: Profile0 (Default) - LastVersion=15.0.1/20120907073726
RelatedPackageVersions:
 totem-mozilla 3.5.92-0ubuntu1~12.10.1
 rhythmbox-mozilla 2.97-1ubuntu5
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/02/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 207
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: A15
dmi.board.vendor: PEGATRON CORPORATION
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: PEGATRON Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr207:bd05/02/2012:svnPEGATRONCORPORATION:pnA15:pvr1.0:rvnPEGATRONCORPORATION:rnA15:rvr1.0:cvnPEGATRONComputerInc.:ct10:cvr1.0:
dmi.product.name: A15
dmi.product.version: 1.0
dmi.sys.vendor: PEGATRON CORPORATION