AI product readBrowser bridge/launcher enabling My Number Card (マイナンバーカード) digital authentication on Japanese government online services via native messaging to a local card reader application
Japanese residents need a way to use their physical My Number Cards for digital authentication on various government web portals (e-tax, local government services, etc.) through Chrome. The extension acts as a communication bridge between government web pages and the native My Number Card reader application.
User visits a government service website → the website detects the extension via a hidden input element → the website dispatches a 'launchApp' custom event → the content script forwards this to the background service worker → the service worker connects to the native 'jp.go.cao.mpa' messaging host → the native app communicates with the physical card reader to read the My Number Card and request PIN → authentication result is returned through the chain back to the government website.
Injects extension detection signals into government web pages so they can confirm the bridge is installedRelays authentication requests from government websites to the native My Number Card reader app (jp.go.cao.mpa) via Chrome native messagingReturns authentication results from the native app back to the government web pageHandles cleanup/disconnection when pages are unloadedSupports 24+ government and related service domains (*.go.jp, e-taxrenkei.jp, local government portals, etc.)
- Target users
- Japanese residents who need to authenticate with online government services using their My Number Card / Users filing taxes, applying for certificates, or accessing local government online portals in Japan
- Extension is very small (4 text files, ~8KB of source), making analysis straightforward
- The native host application (jp.go.cao.mpa) source is not included and is distributed separately via a dedicated installer, so its internals cannot be verified
- No popup UI exists — the extension operates entirely as a content script + background service worker bridge
MonetizationNo paid features detected
No evidence of any paid features, payment platforms, subscriptions, or premium tiers in the extension code. This is a government-provided (内閣府 / Cabinet Office) free tool for enabling My Number Card authentication on government services. The 'pro' keyword hit is only in verified_contents.json metadata and is unrelated to payment.
- Confidence
- 95
- Payment platform
- --
- Source
- AI / High
- Login required
- Yes
- Reason
- The extension is a bridge that enables My Number Card (マイナンバーカード) authentication on Japanese government online services. The extension itself has no login UI, but its core workflow requires the user to authenticate via a physical My Number Card + PIN on destination government services (e.g., *.go.jp tax portals, local government sites). The native host app 'jp.go.cao.mpa' handles the card reader interaction, and the government websites require My Number Card-based identity verification to complete any workflow.
進め方が不明
説明が不十分で、先に進めません。確定申告は書面で行う羽目になりました。
インストールともに連携が円滑に進行できない。進行環境がかなり限定されることで起きている問題であり、もう少し分かりやすくならないのだろうか。これを“普及”のは無理があるだろと私が思うのは勝手。
国税庁のソフトのインストール全てうまく行かない。中間ファイルのセーブ含め、今年ICカードリーダも買ってきたのに。サポート対象と書いてあるのにchromeではダメ?Edgeでダメなら今年も紙提出だわ
図の2/6または3/6から4/6に遷移する説明がない。
別のPCで、扶養親族の申告書を作成しようしてたら、ナンバーガードがロックされてしまいました。申告期現が
この前までは入れてたのにおかしいなぁ…
くそアプリまったく使えない
使用法方法が分らないとほざいてるのは、情弱。PC履歴40年さん、無駄な時間を使ってたな。 情報システム、情報セキュリティ、システム監査などの携わったが、直ぐに必要な情報を確認できたよ。
全然駄目ですね… PC履歴は44年 PC開発メーカーからプログラミング 現在Illustratorデザイナー やってきましたが これは 何をやっても開きもしないです…