Public bug reported:

Lubuntu 19.04 QA-Test of daily (LIVE

dell optiplex 755(c2d e8300, 8gb, radeon HD 2400 pro/xt; driver=radeon)
two dell monitors, dvi-0 [as named in monitor-settings] is landscape & left, 
dvi-1 [as named in monitor-settings] is rotated "left" or in portrait mode & 
positioned to right

as part of QA-test, I use firefox to stream a utube vid, firefox opened
on dvi-1 display so I did it first there, watching vid in window,
pressing <F11> to watch briefly in that mode, then fullscreen. When I
exit fullscreen the firefox window returns to the way it was before I
hit f11&click-fullscreen

I moved window to DVI-0 or left-display with video still streaming, hit
<F11> & watched briefly, then hit fullscreen & watched again briefly.
All was great, then exited fullscreen (same if I hit <ESC> or click the
exit-fullscreen icon) - at this point the window zooms to a maximized
state of DVI-1

It only seemed to do this when the firefox window was maximized on
DVI-0, if I shrunk the firefox-window to use less than full-display
before hitting 'fullscreen' or 'f', it returned to prior-case and just
exited the video fullscreen display.

This issue is cosmetic, operation did not stop working at any point, and
it just required me to re-drag my window to my desired display.

(If i noticed this before (I believe I have), I may not have recorded
bug, just noted it on QA-test comments)

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: firefox 65.0.1+build2-0ubuntu1
ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
Uname: Linux 4.19.0-13-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.10-0ubuntu21
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  lubuntu    1784 F.... pulseaudio
BuildID: 20190214235031
CasperVersion: 1.402
Channel: Unavailable
CurrentDesktop: LXQt
Date: Mon Feb 18 07:02:30 2019
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)
IpRoute:
 default via 192.168.15.19 dev enp0s25 proto dhcp metric 100 
 192.168.15.0/24 dev enp0s25 proto kernel scope link src 192.168.15.198 metric 
100
LiveMediaBuild: Lubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190217)
Locales: extensions.sqlite corrupt or missing
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=65.0.1/20190214235031 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/30/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0DR845
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA10:bd04/30/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0DR845:rvr:cvnDellInc.:ct3:cvr:
dmi.product.name: OptiPlex 755
dmi.sys.vendor: Dell Inc.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco

** Attachment added: "sudo lshw >lshw.txt"
   https://bugs.launchpad.net/bugs/1816352/+attachment/5239456/+files/lshw.txt

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https://bugs.launchpad.net/bugs/1816352

Title:
  firefox-window on dvi0 (display0) fullscreen on exit jumps to dvi1
  (other display)

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