Public bug reported: Under some circumstances, content from one Firefox window hidden behind another leaks onto the top one. Reproducible in both Bionic (with Intel graphics) and Disco (in a VirtualBox VM), reporting this from Disco.
== Steps to reproduce == 1. Open one Firefox window, drag it to the right side of screen to fill the right half, and navigate to https://www.twitch.tv/rifftrax 2. Open another Firefox window, maximize it on top of the first one, and use this topmost window to open https://www.youtube.com/watch?v=P5dxd-ocaE8 and expand the Youtube view to 'theatre' mode == What happens == White parts of content in Firefox window #1 cast a spectral shadow on the black parts of content in Firefox window #2. It's quite subtle, but luckily can be caught in screenshots: see attachments below. Pausing the Youtube video seems to make the effect to go away (the transparency disappears). == What I'd expect to happen == For the topmost window to be completely opaque, i.e. not to see anything from behind the topmost window whether the video is playing or not. == Other info == Though I don't think this is tied the two sites I've used as an example, they're the first and only ones I've happened to encounter this with. I've yet to find other reports about this, apart from one /r/Fedora thread mentioning something similar: https://www.reddit.com/r/Fedora/comments/7m9m4h/youtube_videos_are_transparent_kind_of_in_firefox/ ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: firefox 64.0+build3-0ubuntu1 ProcVersionSignature: Ubuntu 4.19.0-9.10-generic 4.19.8 Uname: Linux 4.19.0-9-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.10-0ubuntu14 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jani 1748 F.... pulseaudio BuildID: 20181207223303 Channel: Unavailable CurrentDesktop: ubuntu:GNOME Date: Sun Dec 16 15:30:58 2018 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2018-09-30 (76 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180930) IpRoute: default via 10.0.2.2 dev enp0s3 proto dhcp metric 100 10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 metric 100 169.254.0.0/16 dev enp0s3 scope link metric 1000 Locales: extensions.sqlite corrupt or missing PrefSources: prefs.js ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fi_FI.UTF-8 SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=64.0/20181207223303 RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/01/2006 dmi.bios.vendor: innotek GmbH dmi.bios.version: VirtualBox dmi.board.name: VirtualBox dmi.board.vendor: Oracle Corporation dmi.board.version: 1.2 dmi.chassis.type: 1 dmi.chassis.vendor: Oracle Corporation dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr: dmi.product.family: Virtual Machine dmi.product.name: VirtualBox dmi.product.version: 1.2 dmi.sys.vendor: innotek GmbH ** Affects: firefox (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug disco ** Attachment added: "Untouched screenshot of top window revealing content from another window below" https://bugs.launchpad.net/bugs/1808690/+attachment/5222682/+files/Kuvakaappaus%20-%202018-12-16%2015-05-24.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808690 Title: Page content slightly transparent, reveals content from another window below To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1808690/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
