Trend User growth trend Review user movement across collected snapshots.
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
Email --
Phone --
Address -- Permissions No permission data
Host access No host access data
何度も同じ作業をさせられる点 エラーの対処が表示されない点 エラーが出ると入力データが全クリアされる点 なにより いつまでたっても改善がされない点 せめて 国税システム程度にしてください
星0ですが,投稿できないので、星1つで投稿します。 毎年ｅＬＴＡＸを操作するのが、嫌になります。せめてＥＴＡＸ並みのシステムに出来ないのでしょうか、 地方税と国税ＷＥＢ上の1本化が、不完全のままです。 納税者の辛抱強さに敬服します。
全く分からない
スムーズに手続きができるように早急な改善を望みます。
つかえない。
使えた人いるんですか？
説明が不親切です。これをインストールしたその先の手続きが知りたいのに、情報が見当たりません。結局、役所へ行って手続きをするしかなさそうです。
つまり、このシステムで何をやりたいのか分からない。ただ単に国民（＝納税者）を困惑させるために使っているのではないか？こんなことは考えたくないが、ひょっとして第三国（？）の差し金？
こんな分かりずらくてややこしいものはないです、素人が簡単にできるように改良をする必要があります、国税のetaxの方が分かりやすい（こちらも不評が多いですが）少額の地方税の申告に行くには役所が遠いのでeLTAXを利用したいと思いましたが結局は無念に終わりました。
これ、使えない気がします。。