Examine source code of MFA Manager

{
  "name": "MFA Manager",
  "description": "MFA Manager",
  "version": "1.0.0",
  "manifest_version": 2,
  "homepage_url": "https://fufild.com",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "MFA Manager",
    "default_icon": {
      "48": "48.png",
      "96": "96.png"
    }
  },
  "icons": {
    "48": "48.png",
    "96": "96.png"
  },
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e43694fa-5270-484c-8798-9f439d6a1872}"
    }
  }
}