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User Growth Over Time 500K 500K 500K 500K 500K 2026年7月13日 2026年7月16日 2026年7月19日 Latest: 500K
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7-day rating change 1.10 1.15 1.20 1.25 1.30 2026年7月13日 2026年7月16日 2026年7月19日 Latest: 1.20
2026年7月13日 2026年7月19日
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Overview Product summary Review the store description, core capabilities, and common use cases.
地方税ポータルシステム（eLTAX）のPCdesk(WEB版)で、電子署名を付与するための拡張機能です。
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AI product read Bridge extension enabling electronic digital signatures on the Japanese local tax portal eLTAX PCdesk (WEB版) by connecting the web application to a native PKI application via Chrome Native Messaging The eLTAX web-based tax filing portal needs to apply digital certificate signatures to tax submissions, but browsers cannot directly access local certificate stores or PKI hardware. This extension solves this by relaying signature requests from the eLTAX web page to a locally installed native application (jp.eltax.elpki) that can access digital certificates and perform cryptographic signing.
1. User navigates to eLTAX portal (portal.eltax.lta.go.jp) and logs in. 2. Content script injects version detection elements so the portal knows the extension is installed. 3. When the user initiates a tax filing requiring electronic signature, the portal dispatches a 'launchElpki' custom DOM event. 4. Content script receives this event and sends it to the background script via chrome.runtime.sendMessage. 5. Background script connects to native messaging host 'jp.eltax.elpki' and forwards the request. 6. Native app performs the digital signature operation using local certificates. 7. Response flows back: native host → background → content script → portal via 'recvElpkiMsg' event. 8. On page unload, the extension sends a close message to cleanly terminate the native app connection.
Detects extension installation and version from the eLTAX web page via injected hidden DOM elements Relays 'launchElpki' custom events from eLTAX web page to native messaging host (jp.eltax.elpki) Returns native host responses back to the web page via 'recvElpkiMsg' custom events Handles connection cleanup when the user leaves the page (beforeunload) Supports both Windows and macOS with platform-specific error codes
Target users Japanese municipalities and businesses filing local taxes through the eLTAX system / Tax accountants and administrative staff using eLTAX PCdesk WEB version Chrome Web Store detail was unavailable (API error), so store description/rating/screenshots could not be reviewed The native messaging host application (jp.eltax.elpki) is not included in the extension package and its behavior is inferred from message patterns Monetization No paid features detected No payment, subscription, upgrade, or billing code exists in the extension. The extension is a simple native messaging bridge for the eLTAX government tax portal, which is a free public government service. No premium features, paywalls, or licensing checks are present in any source file.
Confidence 95
Payment platform --
Source AI / High
Login required Yes
Reason The extension is a helper for the eLTAX (地方税ポータルシステム) government tax portal. The eLTAX PCdesk web system requires user authentication to file local taxes. While the extension itself has no login UI, it only activates on eLTAX portal domains (manifest.json line 19), and the destination service requires a registered municipal account and login to use. The extension cannot fulfill its core purpose (applying electronic signatures to tax filings) without the user being logged into eLTAX. Permission risk Low-risk permissions This estimate uses declared permissions and host permissions to assess access scope and sensitivity.
LOW
Publisher Unknown publisher Independent publisher
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Address -- Permissions No permission data
Host access No host access data
国民の大切なお金でゴミを作らないでほしいです。
とにかく使い辛い。これが国のアプリってことが、間違いなく国民を不幸にさせている。
全然アクセスできない・・・
e-Taxとの連携が非常に悪く、何度も同じ内容の入力を強いられています。
何度同じことをさせるんだ。
源泉所得税と同様に支払い欄の確認は省略し、支払い銀行名に変更があった場合のみとすべきだと思います。
全く意味が分からない。リーダーも買わなきゃいけないの？ 認証局サービスって何？ いろんな選択肢があるがどれを選ぶのが「正解」なの？ 個人としてマイナンバーカードは持ってるけど、「法人」にはマイナンバー（カード）は存在しないから、法人としてeltax利用したいときはどうするの？
役所の連中よくもまあ、こんなくそのようなシステムを国民に押し付けるものだ、犬の方がまだ使える、中国の方が20年は進んでる、役所の連中はこれやばいと思わないのかね？民間の意識と違いすぎ、早くAI導入し半分クビ切るべき
全く意味がわからず 説明を聞いても詳細が無い どの人も星一つ だけど 本とはマイナス100をつける人ばかりだと思う
こんのもの使えるか！税金の無駄遣い。さっさと止めるべき。使う側の利便性とか全く考えてないだろ。どうやったら使い難くなるか知恵を絞ったとしか思えない。よって二度と使わない。以上。