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.
説明が多く何をすれば良いのか分からない、もっと簡潔にやれないのですか申請できません
microsoft edgeにインストールされています。と表示されていますが探しても見つけません。 どの場所を見ればいいですか?またすぐに利用できるアイコンを表示するにはどうすればよいですか?
分かりずらく、希望する情報が得られない
どこの間抜けがこのアプリをつくり配布しているのかと思うと情けなくなる。使えねーじゃないか。どーやってログインするのだ???
既にインストールされていますが無効になっています?度々の変更で無行にしておいてどうやって使えというのか分からない、できればマイナポータルをすべて使用禁止にして、どうぞご使用してくださいとしたらどうですか?
全然使えないです。これじゃ税金かえせですよ
最悪 何故、確定申告するのに、グーグールに個人情報を出さなければいけないのか?
つかえん。ゴミ。イライラだけした
マニュアル作った事ないのかな・・・
全く意味わからない。chromeから削除??拡張機能の削除??画面が開いて何すればよいのか?マイナンバーログインしたいのにどうなってる事やら、先に進めやしない。