Examine source code of Tab Guardian

{
  "manifest_version": 2,
  "name": "__MSG_ext_name__",
  "description": "__MSG_ext_description__",
  "version": "1.18.0",
  "default_locale": "en",
  "web_accessible_resources": [
    "images/*",
    "sounds/*",
    "assets/*"
  ],
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{2355d391-fb52-4933-bfb9-59b666740b79}"
    }
  },
  "icons": {
    "32": "images/icons/icon-32.png",
    "48": "images/icons/icon-48.png",
    "64": "images/icons/icon-64.png",
    "128": "images/icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "images/icons/icon-32.png",
      "48": "images/icons/icon-48.png"
    },
    "default_title": "Tab Guardian",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "assets/background.js"
    ],
    "type": "module"
  }
}