Examine source code of Phone-Free 2FA by ReDD

{
  "manifest_version": 3,
  "name": "Phone-Free 2FA by ReDD",
  "description": "Open-source, local-only authenticator for time-based one-time passwords (TOTP).",
  "version": "2.2",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "side_panel": {
    "default_path": "popup.html"
  },
  "sidebar_action": {
    "default_panel": "popup.html",
    "default_title": "Phone-Free 2FA",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "open_at_install": false
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "tabs",
    "sidePanel"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "redd-2fa@reddfocus.org",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}