Examine source code of Shop Ethical!

{
  "manifest_version": 3,
  "name": "Shop Ethical!",
  "version": "1.6.3",
  "description": "Add Shop Ethical! ratings to brand names on online shopping sites to help you shop ethically online.",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "shopethical-ratings.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "options_ui": {
    "page": "settings.html"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "settings.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "style.css",
        "images/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ratings@ethical.org.au"
    }
  }
}