Failed to open webapp application path dir

Firefox shows this error in console:

** (firefox:11650): WARNING **: Failed to open webapp application path dir /usr/share/ubuntu/unity-webapps/userscripts: Falló al abrir el directorio «/usr/share/ubuntu/unity-webapps/userscripts»: No such file or directory

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: firefox 18.0.2+build1-0ubuntu0.12.10.1
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: simon 2694 F.... pulseaudio
 /dev/snd/controlC0: simon 2694 F.... pulseaudio
BrokenPermissions:
 chrome/brief-custom-style.css (0o411)
 <email address hidden> (0o400)
 extensions/{D46E8522-6E86-44b1-A622-58C0668AD78E}.xpi (0o400)
BuildID: 20130201185534
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Channel: Unavailable
Date: Thu Feb 14 10:39:17 2013
ForcedLayersAccel: False
IncompatibleExtensions: LastPass - <email address hidden>
InstallationDate: Installed on 2013-02-11 (2 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
IpRoute:
 default via 192.168.1.1 dev eth1
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.2
 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.1
MarkForUpload: True
MostRecentCrashID: bp-92e9691f-d15f-4bf3-b188-e7bf52121005
PrefSources:
 prefs.js
 [Profile]/<email address hidden>/defaults/preferences/defaults.js
 [Profile]/extensions/{210249CE-F888-11DD-B868-4CB456D89593}/defaults/preferences/prefs.js
 [Profile]/<email address hidden>/defaults/preferences/prefs.js
 [Profile]/extensions/{E0B8C461-F8FB-49b4-8373-FE32E9252800}/defaults/preferences/defaults.js
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=18.0.2/20130201185534
RelatedPackageVersions:
 rhythmbox-mozilla 2.98-0.3~webupd8~quantal1
 totem-mozilla 3.6.2-0ubuntu1~ubuntu12.10.1
RfKill:

RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/15/2011
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: Ff1
dmi.board.name: X58A-UD5
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFf1:bd05/15/2011:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD5:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD5:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: X58A-UD5
dmi.sys.vendor: Gigabyte Technology Co., Ltd.