Similar thing happened to me in Ubuntu 18.04. Today is the first day of my installation of 18.04. At first Firefox worked fine. Then I was tweaking a few things after the system upgrade to 18.04, and added the date to the top menu bar / task bar by typing "sudo gsettings set org.gnome.desktop.interface clock-show-date true" in the terminal window at the bash prompt. It didn't show the date, so I rebooted, and then it showed the date. Then I clicked on Firefox. And it was not a black screen, not a white screen, but a clear screen. That is, a transparent screen.
"sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox" fixed it for me. Thank you Olivier Tilloy (osomon) ! I have edited /etc/apparmor.d/usr.bin.firefox in the past when Firefox gave a black screen, after updating to Firefox version 51.0.1 two years ago. What fixed it the black screen then is described here: https://bugzilla.mozilla.org/show_bug.cgi?id=1334748#c7 but now my copy of usr.bin.firefox is the same as usr.bin.firefox.dpkg- dist which I think means it's the same as the current distribution file, although I'm not sure, so I don't know what's going on or why this happened. ** Bug watch added: Mozilla Bugzilla #1334748 https://bugzilla.mozilla.org/show_bug.cgi?id=1334748 -- 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/1798999 Title: firefox windows are black in Ubuntu 18.10 Status in firefox package in Ubuntu: Fix Released Bug description: 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu Description: Ubuntu 18.10 Release: 18.10 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center firefox: Installed: 63.0+build1-0ubuntu1 Candidate: 63.0+build1-0ubuntu1 Version table: *** 63.0+build1-0ubuntu1 500 500 http://ubuntu.osuosl.org/ubuntu cosmic/main amd64 Packages 100 /var/lib/dpkg/status 3) What you expected to happen Normal web browsing experience 4) What happened instead Graphical elements are black. After upgrading to 18.10, firefox graphical elements (window contents, context menus) are black. The only exception is a small rectangle in the upper left corner. Right-clicking within the window creates a context menu, which I am able to verify by observing a new black rectangle of the correct width that can be made to occlude the task bar by initiating it at a suitable starting position. If I launch firefox from a terminal then I get messages like the following: --------code [GFX1-]: Failed to lock new back buffer. [Parent 25238, Main Thread] WARNING: failed to open shm: Permission denied: file /build/firefox-MtV3KQ/firefox-63.0+build1/ipc/chromium/src/base/shared_memory_posix.cc, line 129 --------/code This occurs regardless of which desktop environment I use. Other browsers are working fine. I'm guessing the problem is related to the reported problem accessing shm. However, for the sake of completeness, I am using an AMD gpu with standard driver: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X] [1002:6810] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1798999/+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
