thanks  for your replying.  that is surely   not a security issue.  switching 
the window back and forth by clicking firefox window  can solve this problem .  
I  think that is firefox problem.
some other software also has a little bugs.  such as  : intellgence pinyin, 
file  Explore, document viewer (default pdf reader in  OS).  they are not 
deadly,  just need to be  cafurelly,  use them  with regular way.

one serious bug  is still in  ubuntu 22.04  ——  "programming is not
responding" 。  clicking "Force Quit  " or "wait" buttons   cannot solve
the problem.   kill process through "system monitor" is also not okay.
the last thing I can do is rebootint the OS.

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

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Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1971221

Title:
  [nvidia] firefox is flashing

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  when  firefox window  behind other APP  windows,  it  is  flashing.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: xorg 1:7.7+23ubuntu2
  ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
  Uname: Linux 5.15.0-27-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
  .proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: path was not a regular file.
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.suspend: suspend hibernate resume
  .proc.driver.nvidia.suspend_depth: default modeset uvm
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  510.60.02  Wed Mar 16 
11:24:05 UTC 2022
   GCC version:
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: pass
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May  3 11:53:34 2022
  DistUpgraded: Fresh install
  DistroCodename: jammy
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation GP104 [GeForce GTX 1080] [10de:1b80] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Hewlett-Packard Company GP104 [GeForce GTX 1080] [103c:82fb]
  InstallationDate: Installed on 2022-05-01 (1 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 
(20220419)
  MachineType: ASUS System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-27-generic 
root=UUID=ff0f1b3b-e57d-46bf-817b-a2bf7bd47098 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2022
  dmi.bios.release: 14.4
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1404
  dmi.board.asset.tag: Default string
  dmi.board.name: ROG STRIX Z690-A GAMING WIFI D4
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1404:bd04/01/2022:br14.4:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXZ690-AGAMINGWIFID4:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.110-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 22.0.1-1ubuntu2
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:21.1.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2build3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20210115-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.17-2build1

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