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.
国民が最新のPCを使うことを前提として、非常に使いづらい。 古いPCユーザーの存在をないがしろにしているとしか思えない。
確定申告しようとしたら土日祝は0:00からメンテナンスとかお役所かよ!・・あ、お役所だなw 最低データ作成くらいは出来るようにスレよ!
税金泥棒と言わざるを得ない
非常に使いづらい。 心が折れる。 こんなひどいシステムに、私たちの税金が使われているのか。
暇な役人の暇つぶしに作った確定申告台帳 官災だね。
何回インストールしてもその時は使えるが次は使えない。「拡張機能が無い」とか「インストールされていない」と表示される。 これ作った人バカ?
再入力が*.data理解不明こんな難しソフト改正すべき。
指示通りやっていますがうまくいきません 私のやり方が悪いのかシステムが悪いのか(日本政府) 政府にやる気があるのかさえ疑います しばらく放置です
だめだこれは!
全く使えない。終わってる