Mozilla firefox how to solve problem in manifest.json?

Question

Mozilla Firefox

When adding a temporary extension to mozilla firefox, the problem is: Extension is invalid. Reading manifest: Property "description" is unsupported in Manifest Version 1.

manifest.json itself:

{
  "name": "Запускаем снежинки на любом сайте",
  "description": "Проект журнала Код",
  "version": "1.0",
  "manifest_version": 1,

  "permissions": ["activeTab", "scripting"],

  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/get_started16.png",
      "32": "/images/get_started32.png",
      "48": "/images/get_started48.png",
      "128": "/images/get_started128.png"
    }
  },

  "icons": {
    "16": "/images/get_started16.png",
    "32": "/images/get_started32.png",
    "48": "/images/get_started48.png",
    "128": "/images/get_started128.png"
  }
}

Answer 1

Property "description" is unsupported in Manifest Version 1

"manifest_version": 1,
Well, use the 2nd version of the manifest.
The second is not the third.
The 1st version has not been relevant for ten years.