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.
去年はなんとかできましたが、今年はどう頑張ってもできませんでした。 読み取りをしようとするとエラー画面が出て前に進みません。 欠陥品です。
サイトとの連携ができていない。インストールしてもインストールしろと言われる。
ver.16をインストールしているのに、確定申告のE-taxでバージョンが古いとのメッセージが出ます。全然使い物にならない。
何度も何度も堂々巡り、申告迄行きつきません。何とかしてくれ?
民間送達サービスの連携(生命保険株式会社など)が企業によって差異があるためなのか控除証明書データ取得が遅かったり連携されずにエラー表示されて非常にめんどくさい。ヘルプデスクに電話すると20秒ごとに通話料とられるし、担当部署のたらい回しにあったので、結局、税務署に直接行って申告しました。めんどくさくて最悪です。
大変分かり難いです!!!!!!!
起動するとマイナーポータルAPのバージョンが古いって言われて先に進まんw アプリのバージョンは16で最新だし、削除して入れ直しても駄目 これ以上どうしようもできない なんじゃこりゃ 最低だ
昨年より対応ブラウザが増えてもっとややこしく意味不明になってる
先ずは使ってみよう。自信がないが、ダメなら手書きで作成するしかない。
せっかく確定申告のためにカードリーダー買ったが、複雑でまったく理解できない。