Examine source code of kallie Companion

{
  "manifest_version": 3,
  "name": "kallie Companion",
  "version": "1.1.0",
  "description": "Manage your referral codes with kallie",
  "browser_specific_settings": {
    "gecko": {
      "id": "companion@getkallie.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "http://localhost:3001/*",
    "https://api.getkallie.com/*",
    "https://getkallie.com/*",
    "https://app.getkallie.com/*",
    "https://cdn.getkallie.com/*"
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon-16.png",
      "48": "assets/icon-48.png",
      "128": "assets/icon-128.png"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}