Examine source code of Life Quotes

{
  "manifest_version": 3,
  "name": "Life Quotes",
  "description": "Display a random life quote each time you open the popup.",
  "version": "1.0.0",
  "action": {
    "default_title": "Open a life quote",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "lifequotes@example.com",
      "strict_min_version": "109.0"
    }
  }
}