Examine source code of Writepat

{
  "manifest_version": 3,
  "name": "Writepat - Substack Connect",
  "version": "1.1.5",
  "description": "One-click Substack connection for Writepat scheduling.",
  "homepage_url": "https://writepat.com",
  "author": "Writepat",
  "browser_specific_settings": {
    "gecko": {
      "id": "writepat-substack@writepat.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "cookies",
    "storage",
    "tabs"
  ],
  "optional_host_permissions": [
    "https://substack.com/*",
    "https://*.substack.com/*",
    "https://writepat.com/*",
    "https://*.writepat.com/*",
    "http://localhost/*",
    "http://127.0.0.1/*"
  ],
  "icons": {
    "134": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Connect Substack to Writepat",
    "default_icon": {
      "134": "icons/icon128.png"
    }
  }
}