eLTAX PCdesk(WEB版) 拡張機能

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。

Users500K

Rating1.2

Reviews100

Manifest version--

7-day growth0

7-day growth rate0%

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1.21

Latest

1.21

30-day rating change

0.00

2026年5月29日2026年6月4日

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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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The Chrome Web Store shows 100 reviews, but only 0 review bodies have synced into ExtScope so far. Showing the synced reviews available right now.

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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.

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.

未命中敏感权限或广域站点访问规则

Publisher

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Independent publisher

Email: --
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Host access