Examine source code of FolderFlow: Youtube Playlist Folders

{
  "manifest_version": 3,
  "name": "FolderFlow",
  "description": "Simple Way to create Folders in Youtube Playlists UI, and organize your playlists.",
  "version": "2.1",
  "action": {
    "default_popup": "src/pages/popup/index.html",
    "default_icon": {
      "32": "icon-32.png"
    }
  },
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "assets/index.tsx-loader-xOx8-vMM.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ],
      "css": [
        "assets/folder-CYq1ZVxI.css",
        "assets/index-eNpBmvwl.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [],
      "resources": [
        "icon-128.png",
        "icon-32.png"
      ]
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "resources": [
        "assets/folder-IxU42DrU.js",
        "assets/index.tsx-CnnqJ6Hc.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "folderflow@example.com",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  }
}