IDN Safe

IDN Safe is a browser extension which blocks internationalized domain names to prevent you from visiting probable fake sites.

IDN Safe is a powerful browser extension designed to protect users from phishing and spoofing attacks by blocking internationalized domain names (IDNs), also known as punycode domains. These domains can visually mimic legitimate sites due to their use of Unicode, making it easier for attackers to create fake websites that appear authentic depending on the font rendered.

With IDN Safe enabled, suspicious IDN domains are blocked by default to prevent accidental visits to probable fake sites. Users have the flexibility to temporarily allow specific domains or whitelist trusted ones permanently. This tool enhances online security by identifying and mitigating risks associated with maliciously spoofed domains. For more information and feature requests, visit the official GitHub repository.

By:
Aykut Çevik
Daily users:
345 1
Rating:
5.00
(5)
Version:
1.5 Last updated: 2019-10-02
Version code:
4871884
Creation date:
2017-04-25
Risk:
High risk impact Low risk likelihood
Permissions:
  • storage
  • webRequest
  • webRequestBlocking
  • activeTab
  • tabs
  • <all_urls>
Size:
158.79KB
Email:
em*****@aykutcevik.com
URLs:
Website
Full description:
See detailed description
Source:
Firefox Browser Add-ons
Updated:
a day ago

Other platforms

IDN Safe (v1.5.1)
1,000 5.00 (6)
IDN Safe (v1.5.1)
1,333 5.00 (1)

User reviews

by st*****, 2025-03-09

by at*****, 2020-09-20
View all user reviews ›

Extension safety

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

IDN Safe requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
  • Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
  • High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

IDN Safe has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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