Examine source code of TOTP Viewer

{
  "manifest_version": 3,
  "name": "totp-viewer",
  "version": "1.0.3",
  "description": "Simple TOTP code viewer",
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "TOTP Viewer"
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "totp-viewer@harukadev.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}