# IDN-Warner

> Warns if a domain or subdomain is an internationalized domain name to prevent fishing attacks.

Canonical page: [https://chrome-stats.com/d/idn-warner](https://chrome-stats.com/d/idn-warner)

## Overview

- **ID:** `idn-warner`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mirclus
- **Category:** privacy-security,other
- **Daily users:** 41
- **Rating:** 4.00 / 5 (3 ratings)
- **Version:** 1.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-01-05
- **Size:** 15 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/idn-warner/)

## Description

IDN-Warner is a Chrome extension designed to enhance your online security by detecting and warning you about Internationalized Domain Names (IDNs) that may resemble trusted domains. Phishing attackers often exploit visually similar Unicode characters to trick users into visiting malicious sites. This extension places a clear icon in your browser's address bar whenever a domain or subdomain is an IDN, regardless of how the browser displays the URL.

By alerting you to these potentially deceptive domains, IDN-Warner helps prevent phishing attacks and ensures safer browsing. It works independently from the browser's native URL display, providing an additional layer of protection against homograph spoofing threats.

## Rankings

- #17,838 — Overall
- #143 — earn
- #216 — domain
- #244 — prevent

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `webNavigation`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/idn-warner)