Examine source code of Notado

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "0.0.21",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "activeTab",
    "contextMenus",
    "notifications",
    "cookies",
    "webRequest"
  ],
  "host_permissions": [
    "*://*.notado.app/"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "icons": {
    "128": "128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://read.amazon.com/notebook*"
      ],
      "js": [
        "html-sender.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{18a2622f-67a9-4413-b5a5-144d2df07843}"
    }
  }
}