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.
Not initiating.
使い勝手が悪すぎます。
なぜ、R4申告ですでに使用しているY社メルアドがだめなのか? 特定の会社のみなのか? こんなに使用程度が悪い申告作成サイトなのか? 担当者の顔が見たい。 本当のことを言うとお利口になれないのね!!!
マイナンバーカードとカードリーダーがあればネットで色々できて便利
なんだこりゃ! さっきから同じ操作を繰り返してるんだが、前に進まない無限ループになっている。65万の控除させないためのトラップでふるいにかけてるのか? やってくれてるな。
全くわからない
素晴らしいソフト。とっても簡単で使いやすい。なんでもマイナンバーカードに連携して、もっともっと使いやすく便利なシステムにして下さい。このシステムへの投資は税金の本当に正しい使い方です。今後にも期待が持てます。
意味わからん。利用者証明書用電子証明書パスワード(4桁)はどうやって入力するんだい?????
何だこりゃ、少しも進めない、手間代も控除しろ!
なんだこれ 使えなさすぎる。