Thank you for reporting this to Ubuntu. Sometimes extensions can conflict. Could you please try this with a new profile and see if the problem still exists? You do not need to delete your old profile to test. If this helps, you might want to try to disable all your extensions and re-enable them one by one until you find the problematic one.
You can start the profile manager with the following command: firefox -ProfileManager This works fine for me in a Natty VM. ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1010334 Title: fullscreen feature is not working after today's update Status in “firefox” package in Ubuntu: Incomplete Bug description: after i installed a update of firefox today and restarted it , i pressed F11 for fullsreen but it just hid the menu bar. Navigation bar and tabs are not disappearing.Generally they disappear after 1 or 2 seconds after switching on the fullscreen . ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: firefox 13.0+build1-0ubuntu0.11.04.1 ProcVersionSignature: Ubuntu 2.6.38-15.60-generic 2.6.38.8 Uname: Linux 2.6.38-15-generic i686 NonfreeKernelModules: wl AddonCompatCheckDisabled: False AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23. Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: priyank 1647 F.... pulseaudio BuildID: 20120601175858 CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfbd00000 irq 47' Mixer name : 'Intel IbexPeak HDMI' Components : 'HDA:111d7605,10280447,00100105 HDA:80862804,80860101,00100000' Controls : 19 Simple ctrls : 11 Channel: release Date: Fri Jun 8 11:35:34 2012 ForcedLayersAccel: False IfupdownConfig: auto lo iface lo inet loopback InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007) IpRoute: 10.0.26.0/23 dev eth1 proto kernel scope link src 10.0.26.144 metric 2 169.254.0.0/16 dev eth1 scope link metric 1000 default via 10.0.26.1 dev eth1 proto static MostRecentCrashID: bp-ab4e10fe-63e2-4f28-9042-7e33e2110820 PrefErrors: Unexpected character before close parenthesis @ [Profile]/extensions/{fc2b8f80-d9a5-4f51-8076-7c7ce3c67ee3}/defaults/preferences/diigotb.js:4 Unexpected character before close parenthesis @ [Profile]/extensions/{e4a8a97b-f2ed-450b-b12d-ee082ba24781}/defaults/preferences/greasemonkey.js:4 ProcEnviron: LANGUAGE=en_IN:en LANG=en_IN LC_MESSAGES=en_IN.UTF-8 SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=13.0/20120601175858 (In use) RelatedPackageVersions: google-talkplugin 2.9.10.0-1 icedtea-plugin 1.1.1-0ubuntu1~11.04.2 mozilla-plugin-vlc 1.1.9-1ubuntu1.3 totem-mozilla 2.32.0-0ubuntu10 picasa 3.0.5744-02 RunningIncompatibleAddons: False SourcePackage: firefox SubmittedCrashIDs: bp-ab4e10fe-63e2-4f28-9042-7e33e2110820 bp-8dff6c54-66f0-4dea-b094-415a72110704 UpgradeStatus: Upgraded to natty on 2011-11-10 (211 days ago) dmi.bios.date: 11/17/2010 dmi.bios.vendor: Dell Inc. dmi.bios.version: A10 dmi.board.name: 0P2H9M dmi.board.vendor: Dell Inc. dmi.board.version: A10 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A10 dmi.modalias: dmi:bvnDellInc.:bvrA10:bd11/17/2010:svnDellInc.:pnInspironN5010:pvrA10:rvnDellInc.:rn0P2H9M:rvrA10:cvnDellInc.:ct8:cvrA10: dmi.product.name: Inspiron N5010 dmi.product.version: A10 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1010334/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp