Hello, and thank you for the update. That indeed seems unrelated. I'd
suggest looking for reports of similar issues on upstream's tracker
https://bugzilla.mozilla.org to see if anyone else may have run into
this, and if yes then add as much detail as you can in form of a
comment, and if not then consider making a report there as well so as to
bring the issue to the attention of Firefox developers. In either case,
I'd appreciate it if you would please provide the bugzilla bug number
here so we could add it to this bug's metadata.

Thanks again.

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https://bugs.launchpad.net/bugs/2078059

Title:
  MS Teams screen sharing frequently stops working when accessing Teams
  from Firefox

Status in firefox package in Ubuntu:
  New

Bug description:
  Observed:
  I access Teams from Firefox and it works as far as I can tell, including live 
meetings. Occasionally though, when I try to share my screen (it is always a 
specific window I'm sharing), others in the meeting see that I'm sharing 
something, but they don't see the window.
  Firefox seems to work just fine in all other respects: browsing different web 
sites, Teams audio and video etc.

  Expected:
  Others in the meeting should always see the window that I share.

  Repeatability:
  Hard to say. I can have several meetings over a few days and screen sharing 
works fine. When it fails, it fails completely, i.e. it will not work, 
regardless of how many times I try.

  Workarounds:
  * use a different browser for Teams
  * restart Firefox

  Notes:
  I use suspend/resume on my machine a lot, so my browser works for days (with 
several windows open and dozens of tabs, typically), if relevant.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 129.0.2+build1-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.15.0-117.127~20.04.1-generic 5.15.158
  Uname: Linux 5.15.0-117-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu27.27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tomislav   3336 F.... pulseaudio
   /dev/snd/controlC1:  tomislav   3336 F.... pulseaudio
  BuildID: 20240819150008
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug 28 15:38:16 2024
  DefaultProfileExtensions: extensions.sqlite corrupt or missing
  DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  DefaultProfileLocales: extensions.sqlite corrupt or missing
  DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:287
  DefaultProfilePrefSources: prefs.js
  DefaultProfileThemes: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  InstallationDate: Installed on 2022-11-03 (663 days ago)
  InstallationMedia: Ubuntu 20.04.5 LTS "Focal Fossa" - Release amd64 (20220831)
  MostRecentCrashID: bp-774a4f89-c162-4020-bfee-5e8b90230920
  Profile1Extensions: extensions.sqlite corrupt or missing
  Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile1Locales: extensions.sqlite corrupt or missing
  Profile1PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:287
  Profile1PrefSources: prefs.js
  Profile1Themes: extensions.sqlite corrupt or missing
  Profiles:
   Profile1 - LastVersion=129.0.2/20240819150008 (In use)
   Profile0 (Default) - LastVersion=129.0.2/20240819150008 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2021
  dmi.bios.release: 5.19
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KCTGL357.0037.2021.0712.0948
  dmi.board.name: LAPKC71E
  dmi.board.vendor: Intel Corporation
  dmi.board.version: M22221-402
  dmi.chassis.type: 10
  dmi.chassis.vendor: Intel(R) Corporation
  dmi.chassis.version: 2.0
  dmi.ec.firmware.release: 1.5
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrKCTGL357.0037.2021.0712.0948:bd07/12/2021:br5.19:efr1.5:svnIntel(R)ClientSystems:pnLAPKC71E:pvrM38559-402:rvnIntelCorporation:rnLAPKC71E:rvrM22221-402:cvnIntel(R)Corporation:ct10:cvr2.0:skuBKC71EBFB6000:
  dmi.product.family: KC
  dmi.product.name: LAPKC71E
  dmi.product.sku: BKC71EBFB6000
  dmi.product.version: M38559-402
  dmi.sys.vendor: Intel(R) Client Systems

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