Examine source code of Youtube Short Redirection

{
  "description": "Firefox addon to redirect the shorts to the classical YouTube format.",
  "manifest_version": 3,
  "name": "Youtube Short Redirection",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-short-redirection@matthieuDev.com"
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "tabs"
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "action": {
    "default_icon": {
      "16": "icons/no-short-16.png",
      "32": "icons/no-short-32.png"
    },
    "default_title": "There is no shorts, only vertical videos.",
    "theme_icons": [
      {
        "light": "icons/no-short-16.png",
        "dark": "icons/no-short-16-dark.png",
        "size": 16
      },
      {
        "light": "icons/no-short-32.png",
        "dark": "icons/no-short-16-dark.png",
        "size": 32
      }
    ]
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  }
}