This just started happening to me in Ubuntu 15.04 with Firefox 42.0, but only if I run Firefox under the old vtwm window manager:
Firefox 42.0 "Mozilla Firefox for Ubuntu" canonical - 1.0 under Ubuntu 15.04. The browser now (in the past week or two) locks up when requested to enter Full Screen if not running under any window manager (or when running under an old window manager such as vtwm that doesn't have all the modern hooks). Reproduce: 1. Start up Ubuntu 15.04 with the full Unity desktop installed. 2. Clean out (remove or rename) $HOME/.mozilla to start clean. 3. Open Firefox. 4. Note that using F11 correctly resizes Firefox to Full Screen and back down. 5. Kill the window manager: run: initctl stop unity7 6. Return to Firefox and try F11 or turn on "Full Screen" from the menu. 7. Browser locks up. Changing tabs doesn't refresh the screen unless you do something to trigger an X11 refresh such as opening a menu. F11 does *not* undo the damage - the browser stays locked up. Using the Firefox menu to disable (un-check) "Full Screen" also does nothing. Nothing works. 8. Start an old window manager such as "vtwm". No change. Firefox is still locked up. 9. Exit vtwm. 10. Re-start the Unity window manager: run: initctl start unity7 11. Return to Firefox and use F11 or the menu "Full Screen" a few times and Firefox is working again. 12. Repeat as needed. ** Summary changed: - Firefox Screen Freeze + Firefox Screen Freeze in Full Screen mode -- 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/1002453 Title: Firefox Screen Freeze in Full Screen mode Status in firefox package in Ubuntu: Confirmed Bug description: Ubuntu 12.04. Firefox freezes when I enter full screen mode. By freeze, I *do not* mean that it locks up. I can't think of another word to use. What happens is that anything below the top bar becomes unreadable. For example, after a period of time in full screen, if I were to go and begin typing a web address, what usually would come down in a drop menu of recent websites doesn't appear. Also, if I am scrolling down a website, it doesn't register. This is the case until I put the mouse at the top of the screen to bring down the top bar, and at this time the new website will register on the screen. Apologies if this doesn't make enough sense. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: firefox 12.0+build1-0ubuntu0.12.04.1 ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 Uname: Linux 3.2.0-24-generic x86_64 AddonCompatCheckDisabled: False AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: dalton 1866 F.... pulseaudio /dev/snd/pcmC0D0p: dalton 1866 F...m pulseaudio BuildID: 20120423122928 Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf5400000 irq 53' Mixer name : 'Intel IbexPeak HDMI' Components : 'HDA:10ec0269,10431213,00100100 HDA:80862804,10431213,00100000' Controls : 26 Simple ctrls : 12 Channel: release Date: Mon May 21 15:06:08 2012 ForcedLayersAccel: False IfupdownConfig: auto lo iface lo inet loopback InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) IpRoute: default via 192.168.1.1 dev wlan0 proto static 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.3 metric 2 Profiles: Profile0 (Default) - LastVersion=12.0/20120423122928 (Running) RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no RunningIncompatibleAddons: False SourcePackage: firefox UpgradeStatus: Upgraded to precise on 2012-05-18 (3 days ago) dmi.bios.date: 07/01/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 213 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: U43 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.:bvr213:bd07/01/2010:svnASUSTeKComputerInc.:pnU43F:pvr1.0:rvnPEGATRONCORPORATION:rnU43:rvr1.0:cvnPEGATRONComputerInc.:ct10:cvr1.0: dmi.product.name: U43F dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1002453/+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