---
title: "NicoMultiViewer – Chrome extension stats, history and permissions"
description: "13 users, no ratings yet. Version 1.1.2, updated 2026-05-31. Requests 6 permissions."
url: "https://extensiontracker.com/extension/hfmjknaagjhcbkkjphdemaajlhhdiamh"
---

# NicoMultiViewer

Live in the Chrome Web Store.

- Users: 13
- Rating: no ratings yet
- Last checked: 2026-09-27 02:21 UTC
- Users gained in 7 days: – (needs a week of history)
- Users gained in 30 days: – (needs a month of history)
- Rank by users: #138,609 of 264,703 live extensions
- Rank in Accessibility: #5,056 of 7,982

## The listing

What the Chrome Web Store shows, as of the last check.

Summary from the listing:

> ニコニコ生放送を同一タブ内で複数同時視聴したい

- Extension ID: `hfmjknaagjhcbkkjphdemaajlhhdiamh`
- Developer: [なかむーら](https://extensiontracker.com/developer/u6d87b23303d5190c3caa5c693d2e3594)
- Category: [Make Chrome Yours › Accessibility](https://extensiontracker.com/category/make_chrome_yours/accessibility)
- First published: 2026-05-19
- Last updated: 2026-05-31
- Version: `1.1.2`
- Size: 341 KiB
- Minimum Chrome: 88
- Languages (1): 日本語
- Support page: `https://twitter.com/nakamura_keng0`
- Chrome Web Store: <https://chromewebstore.google.com/detail/nicomultiviewer/hfmjknaagjhcbkkjphdemaajlhhdiamh>
- View the code or download the CRX, in CRX Viewer: <https://robwu.nl/crxviewer/?crx=https%3A%2F%2Fchromewebstore.google.com%2Fdetail%2Fhfmjknaagjhcbkkjphdemaajlhhdiamh>

## Users over time

One row per check, newest first, as shown on the Chrome Web Store.

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-09-27 | 13 | – | – |

## What changed

Every change found on a check, newest first.

No changes found since tracking began on 2026-09-27.

## What it can access

From the extension's manifest, in plain language.

### Sites

- `https://*.nicovideo.jp/*`: nicovideo.jp and its subdomains

### Sites where it runs scripts

- `https://live.nicovideo.jp/watch/*`: live.nicovideo.jp
- `https://live2.nicovideo.jp/watch/*`: live2.nicovideo.jp

### Browser features

- `declarativeNetRequest`: Block or change network requests, using rules
- `declarativeNetRequestWithHostAccess`: Block or change network requests on the sites it can reach
- `scripting`: Run scripts on sites it can reach
- `storage`: Save settings and data in your browser
- `tabs`: Read the addresses and titles of your tabs

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [NicoViewer](https://extensiontracker.com/extension/fnkechmaclbijldkepjjknpkeplakmon) | 133 | 3.00 | 1 | Accessibility |
| [NicoGeViewer](https://extensiontracker.com/extension/jjpgmdlmejphlnadhkccplgffgkidfoc) | 11 | 5.00 | 1 | Entertainment |

All 3 extensions by [なかむーら](https://extensiontracker.com/developer/u6d87b23303d5190c3caa5c693d2e3594).

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every month, and again whenever a new version appears. Last checked 2026-09-27 02:21 UTC; next check around 2026-10-05.

How the data is collected: <https://extensiontracker.com/methodology>.

## Cite this page

Extension Tracker. “NicoMultiViewer” (hfmjknaagjhcbkkjphdemaajlhhdiamh). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/hfmjknaagjhcbkkjphdemaajlhhdiamh. Accessed 2026-09-28.

```bibtex
@misc{extensiontracker_hfmjknaagjhcbkkjphdemaajlhhdiamh,
  title   = {NicoMultiViewer (hfmjknaagjhcbkkjphdemaajlhhdiamh)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/hfmjknaagjhcbkkjphdemaajlhhdiamh},
  urldate = {2026-09-28}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/hfmjknaagjhcbkkjphdemaajlhhdiamh>. It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (<https://creativecommons.org/licenses/by/4.0/>), crediting Extension Tracker. Extension, developer and list pages come as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.