---
title: "Privacy Guardrail – Chrome extension stats, history and permissions"
description: "5,000 users, rated 5.00 by 9 people. Version 0.5.0, updated 2026-09-23. Requests 7 permissions."
url: "https://extensiontracker.com/extension/mcfmihbghefbeeaapopamagaalkbanmp"
---

# Privacy Guardrail

Live in the Chrome Web Store.

- Users: 5,000
- Rating: 5.00 from 9 ratings
- Last checked: 2026-11-09 15:52 UTC
- Users gained in 7 days: No change
- Users gained in 30 days: +1,000 (+25.0%)
- Rank by users: #10,132 of 292,131 live extensions
- Rank in Privacy & Security: #275 of 5,693

## The listing

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

Summary from the listing:

> Review and replace personal data in text before pasting into LLM chats. Runs locally in your browser. Assistive only.

- Extension ID: `mcfmihbghefbeeaapopamagaalkbanmp`
- Developer: [Deutsches Forschungszentrum für Künstliche Intelligenz](https://extensiontracker.com/developer/u24e2931ff5c5cdbb6d3eb33120e50f2c)
- Enhanced Safe Browsing: Trusted ([what this means](https://extensiontracker.com/enhanced-safe-browsing))
- Category: [Make Chrome Yours › Privacy & Security](https://extensiontracker.com/category/make_chrome_yours/privacy)
- First published: 2026-05-21
- Last updated: 2026-09-23
- Version: `0.5.0`
- Size: 160 MiB
- Minimum Chrome: 88
- Languages (1): English
- Support page: `https://github.com/dfki-dsa/pii-guardrail-browser-extension`
- Chrome Web Store: <https://chromewebstore.google.com/detail/privacy-guardrail/mcfmihbghefbeeaapopamagaalkbanmp>
- View its code or download CRX: <https://crxpeek.com/extension/mcfmihbghefbeeaapopamagaalkbanmp>
- Search Google for the ID: <https://www.google.com/search?q=%22mcfmihbghefbeeaapopamagaalkbanmp%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 | 5,000 | 5.00 | 9 |
| 2026-11-02 | 5,000 | 5.00 | 8 |
| 2026-10-26 | 5,000 | 5.00 | 8 |
| 2026-10-19 | 4,000 | 5.00 | 8 |
| 2026-10-12 | 4,000 | 5.00 | 8 |
| 2026-10-05 | 4,000 | 5.00 | 8 |
| 2026-09-29 | 4,000 | 5.00 | 8 |
| 2026-09-27 | 4,000 | 5.00 | 8 |

## 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.

### Sites

- `https://chat.openai.com/*`: chat.openai.com
- `https://chatgpt.com/*`: chatgpt.com
- `https://claude.ai/*`: claude.ai
- `https://gemini.google.com/*`: gemini.google.com

### Sites where it runs scripts

- `https://chat.openai.com/*`: chat.openai.com
- `https://chatgpt.com/*`: chatgpt.com
- `https://claude.ai/*`: claude.ai
- `https://gemini.google.com/*`: gemini.google.com

### Browser features

- `offscreen`: Open a hidden page for background work
- `storage`: Save settings and data in your browser
- `tabs`: Read the addresses and titles of your tabs

## 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 15:52 UTC; next check around 2026-11-16.

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

## Cite this page

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

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

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/mcfmihbghefbeeaapopamagaalkbanmp>. 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`.