Public bug reported:

As I said in the title the menu with the 3 workspaces flashes if you
switch from a normal workspace to a workspace that has a fullscreen
video in Firefox.

How to reproduce

* Open Firefox
* Open a video in full screen (I tested prime video and twitch)
* Press and keep pressed ctrl-alt and arrow to move between workspaces
* When you reach the video workspaces still keep pressed ctrl-alt

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 82.0+build2-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: wl
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  sibilant   2096 F.... pulseaudio
BuildID: 20201014125134
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov  4 16:28:48 2020
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:361
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
InstallationDate: Installed on 2020-11-03 (1 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
IpRoute:
 default via 192.168.1.254 dev wlp2s0 proto dhcp metric 600 
 169.254.0.0/16 dev docker0 scope link metric 1000 linkdown 
 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 
 192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.92 metric 600
Profile0Extensions: extensions.sqlite corrupt or missing
Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile0Locales: extensions.sqlite corrupt or missing
Profile0PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:361
Profile0PrefSources: prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=82.0/20201014125134 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/12/2020
dmi.bios.vendor: Apple Inc.
dmi.bios.version: 232.0.0.0.0
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-6F01561E16C75D06
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro9,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-6F01561E16C75D06
dmi.modalias: 
dmi:bvnAppleInc.:bvr232.0.0.0.0:bd04/12/2020:svnAppleInc.:pnMacBookPro9,2:pvr1.0:rvnAppleInc.:rnMac-6F01561E16C75D06:rvrMacBookPro9,2:cvnAppleInc.:ct10:cvrMac-6F01561E16C75D06:
dmi.product.family: MacBook Pro
dmi.product.name: MacBookPro9,2
dmi.product.sku: System SKU#
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1902900

Title:
  Workspaces menu flashes  when moving between workspace A and workspace
  B having B  Firefox with a video in full screen on it

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