Examine source code of Thoreau Inspired

{
  "manifest_version": 3,
  "name": "Thoreau Inspired — Random Quotes",
  "description": "Click the toolbar button to see a Henry David Thoreau–inspired quote in an elegant popup.",
  "version": "1.0.0",
  "action": {
    "default_title": "Thoreau Inspired Quotes",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "thoreau-inspired-quotes@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}