What our analysis found

マイナポータル, used by 2,000,000 people, showed no malicious code in Extension Auditor's review. It comes from a publisher with 5 extensions and was last updated in September 2026.

The extension is a legitimate government app for Japan's My Number card authentication. It uses nativeMessaging to communicate with the official native card reader software, injections are limited to a small set of. and administrative service domains, and no network requests, obfuscation, or dynamic code execution occurs. The low user rating stems from functional issues (hardware requirements, setup), not security concerns. The ML model gave a risk score of 0.00; the third-party risk engine flagged nativeMessaging as high, but in this context it is the extension's core purpose and properly restricted.