Firefox lost Unity integration: maximize window shows regular window bar.

[Pablo Piaggio]

Firefox no longer maximizes as a Unity application. It keeps its main window bar, including close, minimize, and maximize buttons, at all times. This happens even when maximized.

I've tried maximizing and unmaximizing using all know methods (double click, pressing button, and dragging windows to the global panel), but no luck.

Here's a screenshot of the Firefox windows maximized and showing buttons on both the regular window, and in the global menu:

http://i.imgur.com/L6zbymJ.png?1

This happens in all Firefox profiles.

Thanks in advance for your help.

Additional info:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise

$ uname -a
Linux vaughan 3.2.0-53-generic #81-Ubuntu SMP Thu Aug 22 21:01:03 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ apt-cache policy firefox
firefox:
  Installed: 24.0+build1-0ubuntu0.12.04.1
  Candidate: 24.0+build1-0ubuntu0.12.04.1
  Version table:
 *** 24.0+build1-0ubuntu0.12.04.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
        100 /var/lib/dpkg/status
     11.0+build1-0ubuntu4 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: firefox 24.0+build1-0ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.2.0-53.81-generic 3.2.50
Uname: Linux 3.2.0-53-generic x86_64
NonfreeKernelModules: nvidia
AddonCompatCheckDisabled: False
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 0/1
   Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: pablo 1817 F.... pulseaudio
 /dev/snd/controlC0: pablo 1817 F.... pulseaudio
 /dev/snd/pcmC0D0p: pablo 1817 F...m pulseaudio
BuildID: 20130911164256
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdffdc000 irq 43'
   Mixer name : 'SigmaTel STAC9227'
   Components : 'HDA:83847618,102801dd,00100201'
   Controls : 39
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'U0x46d0x809'/'USB Device 0x46d:0x809 at usb-0000:00:1d.7-5, high speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0809'
   Controls : 2
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 6400
   Mono: Capture 4516 [71%] [23.64dB] [on]
Channel: Unavailable
Date: Thu Sep 26 13:41:30 2013
DefaultProfilePrefSources: prefs.js
ExecutablePath: /usr/lib/firefox/firefox
ForcedLayersAccel: False
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
IpRoute:
 default via 192.168.1.254 dev eth0 proto static
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.116 metric 1
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profile1PrefSources: prefs.js
Profile2PrefSources:
 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=24.0/20130911164256 (In use)
 Profile1 - LastVersion=24.0/20130911164256
 Profile2 - LastVersion=24.0/20130911164256
RelatedPackageVersions:
 rhythmbox-mozilla 2.96-0ubuntu4.3
 totem-mozilla 3.0.1-0ubuntu21.1
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 05/24/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.4.0
dmi.board.name: 0WG864
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.4.0:bd05/24/2007:svnDellInc.:pnDellDM061:pvr:rvnDellInc.:rn0WG864:rvr:cvnDellInc.:ct6:cvr:
dmi.product.name: Dell DM061
dmi.sys.vendor: Dell Inc.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.