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.
全くわからない。当然うまくいかない
何年やっても使いにくいまま。
「アプリを起動しています」という画面が5分以上 やっと諸々のメニューが出てきて、いざ手続きを開始しようと思い「引っ越し」をクリック そしたらまた「アプリを起動しています」を5分以上 先程と同じメニューが出てくる これの無限ループ 使い物にならない 時間を返せ 我々の税金で一体何を作ったんだ ふざけるな
星はマイナス100 酷い 使いずらいとかいう以前の問題と感じます
拡張機能が追加されていないのに「拡張機能をインストールしろ」とはどういうことか。
PC版インストールできてるのかわからない。スマホ版も使い勝手が悪すぎる。レビューもほとんど星一つだが何ら改善されていない。担当者は何をしているのですか!
難解すぎる!誰が作成しているのか…
解らない
手続きが必要な高齢者には理解不能。このページから先に進む事が出来ないため断念した。メール等での指導ではなく、電話応対が可能となるよう願いたい。
実に腹の立つシステムだ。ログインできない。インストールしなおせ。それでもえらー。 年金ネットもエラー。秘密の質問代えてないのにエラー。くそシステム。