Examine source code of YouTube Customizer

{
  "name": "YouTube Customizer",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "1.5.3",
  "manifest_version": 3,
  "icons": {
    "16": "resources/icons/icon_16.png",
    "18": "resources/icons/icon_18.png",
    "19": "resources/icons/icon_19.png",
    "32": "resources/icons/icon_32.png",
    "48": "resources/icons/icon_48.png",
    "64": "resources/icons/icon_64.png",
    "128": "resources/icons/icon_128.png"
  },
  "action": {
    "default_icon": {
      "16": "resources/icons/icon_16.png",
      "18": "resources/icons/icon_18.png",
      "19": "resources/icons/icon_19.png",
      "32": "resources/icons/icon_32.png",
      "48": "resources/icons/icon_48.png"
    },
    "default_title": "YouTube Customizer",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "shared.js",
        "inject.js"
      ],
      "css": [
        "resources/skin/injectStyle.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6fa22361-a688-4341-a195-5c6ff257c9e4}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android ": {
      "strict_min_version": "142.0"
    }
  }
}