dell [optiplex] 755 (c2d-e8300, 8gb, amd/ati radeon rv610/radeon hd2400
pro/xt)

I rebooted the dell 755, using same QA-Test Lubuntu 19.04 daily image,
adjusted monitor setup to match my setup, then firefox. Here I went
wrong as I'd planned to load GHOSTERY before going to utube... but
loaded ublock.origin (as I do 66%+ of tests), so removed it & then
loaded ghostery.

On utube, tried my ~methodical/habitual window (unmaximized), f11,
fullscreen, window (maximized), f11 & fullscreen for each display & no
issues at all.

--
Rebooted, adjusted screens, loaded firefox & carefully loaded GHOSTERY.  then 
utube & not like any mainscreen vids selected one I don't mind musically.. With 
it playing did the window (unmaximized), f11, fullscreen, window (maximized), 
f11 & fullscreen for each display & again NO ISSUES AT ALL.

I did note the maximized window on dvi1 wasn't using whole of display
(using top 80%), but that isn't  this issue...

I WASN'T ABLE TO RE-CREATE THIS BUG's ISSUE though !


** Attachment added: "maximized firefox on dvi1  - not related to this bug, but 
noted in this comment"
   
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1816352/+attachment/5240868/+files/maximized_on_dvi1.jpg

** Changed in: firefox (Ubuntu)
       Status: New => Incomplete

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

Title:
  Lubuntu 19.04: firefox-window on dvi0 (display0) fullscreen on exit
  jumps to dvi1 (other display)

Status in firefox package in Ubuntu:
  Incomplete

Bug description:
  Lubuntu 19.04 QA-Test of daily (LIVE)

  //-- 
  2019-02-22 QA-Test & I was unable to replicate this
  today I used ublock.origin; could it be on original report I used ghostery & 
issue is addon?????
  --//

  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.

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