Is NCD Helper safe to install?

What data it declares

The developer declares that it collects these kinds of data:

• Personally identifiable information such as name, address, email address or age

The developer also certifies that your data is not sold to third parties outside approved uses, not used for purposes unrelated to the extension's core function, and not used to decide creditworthiness or lending.

The listing links to a privacy policy.

This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

What Chrome asks you to allow

When you add it, Chrome asks you to allow it to:

• Read and change your data on system.ncd.or.jp and www.emuyn.net
• Modify data you copy and paste
• Read data you copy and paste

Derived from the manifest by Chrome's documented rules; the dialog's exact wording depends on your Chrome version and language. Chrome asks again if an update requests more.

What it can reach

Specific sites only: 1 match pattern.

• https://system.ncd.or.jp/* only system.ncd.or.jp

Reaches your browsing data or every site

• Read what you have copied clipboardRead

Routine for an extension

• Put data on your clipboard clipboardWrite
• Keep the screen or system awake power
• Store data in your browser storage

Pages it runs its code on

It runs its own code on specific pages only: 13 site patterns.

• https://system.ncd.or.jp/karte/page/* only system.ncd.or.jp
• https://system.ncd.or.jp/karte/htmldoc/* only system.ncd.or.jp
• https://system.ncd.or.jp/JNR/page/* only system.ncd.or.jp

A content script is code the extension injects into pages matching these patterns. On those pages it can read and change what you see, whether or not a host permission is listed above.

How usual this is for its category

In Productivity · Tools, 20% of extensions ask for access to every site. This one: Access to specific sites only.

The typical extension there declares 3 browser permissions; this one declares 4 browser permissions.

• Read what you have copied (clipboardRead): 2% of extensions in this category ask for it.

Counted over the live extensions of the same category after our latest full pass of the store. A share is context, not a verdict: what is normal depends on what the extension is for.

Who uses it and how it is kept up

450 users

• Last updated in the store 4 days ago, on 2026-10-29.
• We have seen 1 new version in the last 90 days.

What the store shows

• Established publisher The store's badge for publishers with a good record and no history of violations.
• Trader The publisher has declared itself a trader under EU rules.

Has it asked for more over time?

This is the question a permission list on its own cannot answer. An extension that shipped narrow and widened later is a different proposition from one that always asked for the same thing.

The permissions this extension requests have not changed since we started watching it.

Versions we have seen

1. 2026-10-29Version 7.2.6

Who publishes it

emuyn.llc, who publishes 4 listings we track. This listing has been in the store since 2025-01-02 and was last updated on 2026-10-29.

Similar extensions that ask for less

Listings close to this one in what they say they do, which declare less reach. Less reach is not a verdict on either: compare what each needs for the job.

1. HOMIS Toolkit No site access · 4 permissions 9 users
2. Infera - Ubiquity Access to specific sites only · 2 permissions, 6 site patterns 108 users ★ 5.0
3. ACGME Surgery Case Log AutoLogger Pro Access to specific sites only · 3 permissions, 1 site pattern 16 users

How to check or remove it in Chrome

1. Type chrome://extensions in the address bar and find the extension in the list.
2. Open its details. The site access setting shows where it can run; set it to run only on click and it reaches a page only after you press its icon.
3. To uninstall it, choose Remove on the same page.

Questions people ask

What can NCD Helper access?

Specific sites only: 1 match pattern. It declares 4 browser permissions.

What data does NCD Helper collect?

The developer declares that it collects these kinds of data: Personally identifiable information. This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

Has NCD Helper asked for more permissions over time?

The permissions this extension requests have not changed since we started watching it.

Does NCD Helper publish a privacy policy?

Yes, the store listing links to a privacy policy.