Examine source code of Open in Notion app

{
  "manifest_version": 2,
  "name": "Open in Notion App",
  "description": "Open notion documents with your desktop application directly",
  "version": "1.3.3",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.notion.so/*",
    "storage"
  ],
  "options_ui": {
    "page": "src/options.html"
  },
  "background": {
    "scripts": [
      "src/settings.js",
      "src/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{58023c2f-0bbe-4f8e-abc5-12f8abf98c7e}"
    }
  }
}