Is MARC21 Viewer safe to install?

What data it declares

The developer declares that it does not collect or use your data.

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 libris.kb.se

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.

• *://libris.kb.se/* only libris.kb.se

Routine for an extension

• Add items to the right-click menu contextMenus
• Store data in your browser storage

What it may ask for later

Not granted when you add it: Chrome asks you the moment the extension requests one of these, and you can refuse. It may later ask for access to every site.

• <all_urls> every site

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 2 browser permissions.

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

109 users

• Last updated in the store 199 days ago, on 2026-04-23.
• No new version in the last 90 days.

What the store shows

The store shows none of its badges on this listing. Most listings carry none.

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.

Who publishes it

bibliotekarien.se. This listing has been in the store since 2026-04-20 and was last updated on 2026-04-23.

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. CSN Library Search Plugin No site access · 2 permissions 25 users
2. N.C. State Library GOBI Linky Access to specific sites only · 1 site pattern 7 users
3. U of Illinois GOBI Linky Access to specific sites only · 2 site patterns 37 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 MARC21 Viewer access?

Specific sites only: 1 match pattern. It declares 2 browser permissions.

What data does MARC21 Viewer collect?

The developer declares that it does not collect or use your data. This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

Has MARC21 Viewer asked for more permissions over time?

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

Does MARC21 Viewer publish a privacy policy?

Yes, the store listing links to a privacy policy.