Examine source code of Link Lantern

{
  "manifest_version": 3,
  "name": "Link Lantern",
  "description": "Warns you about recently created domains.",
  "version": "0.4.0",
  "icons": {
    "16": "assets/icons/default/icon-16.png",
    "32": "assets/icons/default/icon-32.png",
    "48": "assets/icons/default/icon-48.png",
    "128": "assets/icons/default/icon-128.png"
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "host_permissions": [
    "https://api.linklantern.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "public_suffix_list.js",
        "domain_age.js",
        "popup.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "preferred_environment": [
      "service_worker",
      "document"
    ],
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "domains.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Link Lantern",
    "default_icon": {
      "16": "assets/icons/gray/icon-16.png",
      "32": "assets/icons/gray/icon-32.png",
      "48": "assets/icons/gray/icon-48.png",
      "128": "assets/icons/gray/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{27943856-3c3d-4646-82d4-821d6e80c84a}",
      "strict_min_version": "136.0"
    }
  }
}