The bug mentioned in comment #4 has been marked as a duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=793501
A Mozilla developer has written a set of patches to correct the bug. They are currently undergoing testing. ** Bug watch added: Mozilla Bugzilla #793501 https://bugzilla.mozilla.org/show_bug.cgi?id=793501 ** Package changed: compiz (Ubuntu) => firefox (Ubuntu) ** Also affects: firefox via https://bugzilla.mozilla.org/show_bug.cgi?id=793501 Importance: Unknown Status: Unknown -- 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/1107850 Title: Square area in top left of desktop slow to load when launching Firefox Status in The Mozilla Firefox Browser: Unknown Status in “firefox” package in Ubuntu: Confirmed Bug description: When launching Firefox (18.0.1 Mozilla Firefox for Ubuntu canonical 1.0) an area of the desktop in the top left of the screen is slow to load. See attached file. Although I am using 12.04 (fully updated, including proposed) I know this also affect people with 12.10. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: compiz 1:0.9.7.12-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-36.57-generic-pae 3.2.35 Uname: Linux 3.2.0-36-generic-pae i686 .tmp.unity.support.test.0: ApportVersion: 2.0.1-0ubuntu17.1 Architecture: i386 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz Date: Mon Jan 28 12:32:18 2013 DistUpgraded: 2012-04-29 16:10:31,037 DEBUG failed to SystemUnLock() (E:Not locked) DistroCodename: precise DistroVariant: ubuntu GraphicsCard: Advanced Micro Devices [AMD] nee ATI RC410 [Radeon Xpress 200] [1002:5a61] (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:2a3d] InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 002: ID 058f:9360 Alcor Micro Corp. 8-in-1 Media Card Reader MachineType: HP Pavilion 061 RA918AA-ABU t3510.uk MarkForUpload: True PackageArchitecture: all ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-36-generic-pae root=UUID=95627c5a-4942-4b2a-81f0-b937540facaf ro radeon.modeset=1 resume=UUID=cc873305-f512-4d29-9d31-46311cd5e830 quiet splash vt.handoff=7 SourcePackage: compiz UpgradeStatus: Upgraded to precise on 2012-04-29 (273 days ago) dmi.bios.date: 04/10/2006 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3.11 dmi.board.name: Asterope dmi.board.vendor: Hewleet-Packard dmi.board.version: 1.0 dmi.chassis.type: 3 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.11:bd04/10/2006:svnHPPavilion061:pnRA918AA-ABUt3510.uk:pvr00E0211RE101ASTE200:rvnHewleet-Packard:rnAsterope:rvr1.0:cvn:ct3:cvr: dmi.product.name: RA918AA-ABU t3510.uk dmi.product.version: 00E0211RE101ASTE200 dmi.sys.vendor: HP Pavilion 061 version.compiz: compiz 1:0.9.7.12-0ubuntu1 version.libdrm2: libdrm2 2.4.39-0ubuntu0.1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-0ubuntu0.3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-0ubuntu0.3 version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.11 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2 To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1107850/+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