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.
使うとブルー画面になる。ヤバい。 すぐに削除した。
不便と感じた点: ・PCにマイナンバーカードのチップを読み取るデバイスが無いのがほとんどなので、携帯が必要 ・携帯にマイナンバーカードのチップを読み取る機能が無いと詰む 良かった点: ・保険証の紐づけは簡単だった 感想: 保険証の紐づけだけに限っては、 役所に行って、書類記載をするよりは楽だと思う 他機能(住所変更・年末調整・確定申告など)は使用してないので不明
とても分かりづらく、不親切設計に感じます。結局PCからもスマホからもできませんでした。 いかにもお役所仕事って感じです。 全く便利になるとは思えません。税金を有効に使ってください。 お願いしますよ!
簡単に使えるようにしろよ、税金の無駄使いも甚だしいわ。 なかまで遊んでんじゃねえわ。
操作画面がPC画面と全然一致しない。 さっぱり操作方法がわからない。 高知能のお役人様専用解説、万人にわかるように書いてほしい。
使い物にならない。何のためのシステムか?
使えない。(笑)
全く使えない、デジタル庁何をやっている。
全く使えない。 税金の無駄使いといわれてもしかたないレベル。 これじゃあ、普及しない。
高齢者ですが、大変不便を感じました。もっと誰でも簡単に利用出来るようにお願いしたいです。