---
title: "STUDY4 – Chrome extension stats, history and permissions"
description: "10,000 users, rated 4.29 by 14 people. Version 0.6, updated 2026-04-23. Requests 12 permissions."
url: "https://extensiontracker.com/extension/jefmonmbihnpfebehladbckmmfjncabp"
---

# STUDY4

Live in the Chrome Web Store.

- Users: 10,000
- Rating: 4.29 from 14 ratings
- Last checked: 2026-11-09 06:52 UTC
- Users gained in 7 days: No change
- Users gained in 30 days: No change (+0.0%)
- Rank by users: #5,041 of 292,131 live extensions
- Rank in Education: #162 of 12,901

## The listing

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

Summary from the listing:

> STUDY4 Extension

- Extension ID: `jefmonmbihnpfebehladbckmmfjncabp`
- Developer: [A PLUS TECHNOLOGY CO.,LTD](https://extensiontracker.com/developer/u18a6c7b88ba7291103f371715fdba008)
- Enhanced Safe Browsing: Trusted ([what this means](https://extensiontracker.com/enhanced-safe-browsing))
- Category: [Productivity › Education](https://extensiontracker.com/category/productivity/education)
- First published: 2021-11-29
- Last updated: 2026-04-23
- Version: `0.6`
- Size: 240 KiB
- Minimum Chrome: 88
- Languages (1): Tiếng Việt
- Privacy policy: `https://study4.com/privacy/`
- Chrome Web Store: <https://chromewebstore.google.com/detail/study4/jefmonmbihnpfebehladbckmmfjncabp>
- View its code or download CRX: <https://crxpeek.com/extension/jefmonmbihnpfebehladbckmmfjncabp>
- Search Google for the ID: <https://www.google.com/search?q=%22jefmonmbihnpfebehladbckmmfjncabp%22&tbs=li:1>

## Users over time

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

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-11-09 | 10,000 | 4.29 | 14 |
| 2026-11-02 | 10,000 | 4.29 | 14 |
| 2026-10-26 | 10,000 | 4.29 | 14 |
| 2026-10-19 | 10,000 | 4.29 | 14 |
| 2026-10-12 | 10,000 | 4.29 | 14 |
| 2026-10-06 | 10,000 | 4.29 | 14 |
| 2026-09-29 | 10,000 | 4.29 | 14 |
| 2026-09-27 | 10,000 | 4.29 | 14 |

## What changed

Every change found on a check, newest first.

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

## Developer history

Moves to another publisher account and new contact emails, newest first.

No move to another account and no new contact email since tracking began on 2026-09-27.

We know contact emails only by a keyed hash, so they're never shown. Recent changes: [Account and contact changes](https://extensiontracker.com/owners/).

## What it can access

From the extension's manifest, in plain language.

**Every website:** it can read and change your data on all the sites you visit.

### Sites

- `https://dict.laban.vn/*`: dict.laban.vn
- `https://dictionary.cambridge.org/*`: dictionary.cambridge.org
- `https://glosbe.com/*`: glosbe.com
- `https://ozdic.com/*`: ozdic.com
- `https://study4.com/*`: study4.com
- `https://study4.online/*`: study4.online
- `https://www.collinsdictionary.com/*`: www.collinsdictionary.com
- `https://www.dictionary.com/*`: www.dictionary.com
- `https://www.ldoceonline.com/*`: www.ldoceonline.com
- `https://www.thesaurus.com/*`: www.thesaurus.com
- `https://www.wordhippo.com/*`: www.wordhippo.com

### Sites where it runs scripts

- `*://*/*`: Every website

### Browser features

- `storage`: Save settings and data in your browser

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every week, because it has 1,000 or more users, and again whenever a new version appears. Last checked 2026-11-09 06:52 UTC; next check around 2026-11-16.

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

## Cite this page

Extension Tracker. “STUDY4” (jefmonmbihnpfebehladbckmmfjncabp). Chrome Web Store data, last checked 2026-11-09. https://extensiontracker.com/extension/jefmonmbihnpfebehladbckmmfjncabp. Accessed 2026-11-13.

```bibtex
@misc{extensiontracker_jefmonmbihnpfebehladbckmmfjncabp,
  title   = {STUDY4 (jefmonmbihnpfebehladbckmmfjncabp)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-11-09},
  url     = {https://extensiontracker.com/extension/jefmonmbihnpfebehladbckmmfjncabp},
  urldate = {2026-11-13}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/jefmonmbihnpfebehladbckmmfjncabp>. 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. Every page except search comes as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.