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.
同じものを毎年ダウンロードさせてインストールさせられますが、本当に毎年必要ですか? 国のアプリ製作者の様な、最新のパソコンでもHDDの容量もないのですよ! 国のシステムはほんとにお粗末ですよ、あれもこれも! 真剣に民間のシステム習って良くして下さい。 ・・・と書いても、誰にも何にも届かないんでしょうけどね・・・ 必要性もわからず、妙なアプリをダウンロードさせられて、インストールさせられて、悲しい国民です。
まったく意味不明、確定申告に不要
最低! エラーばかり。確定申告できない。
星一つもつけられないゴミアプリ。原因不明のエラーばかりでいつになったら確定申告ができるのだろう。 役所仕事で業者に丸投げしてさらには中華に孫請けにだされる課程で中抜きされたせいで開発工程をかけれれ無かった?
説明が全く分かりません。毎年同じですが、ひどいと思います。
毎年思うが本当に分かりづらいアプリ
本当にひどい 確定申告をわざわざ大変にさせるとかあり得ませんね さすがお役所の仕事って感じです
0点酷いソフト
原因不明のエラー 対処方法についての説明もなし
去年のほうが圧倒的にサクサク進められた。今年は本当に意味が分からなかった。およそ6年前ぐらいに税務署でID、パスワード方式でやらせてもらったがアレが一番わかりやすく、かつ、簡単にログイン出来てやりやすかった。年々難解にするぐらいなら、あの時ぐらいの簡素なものにしてほしい。