IDND pops up a warning message whenever the domain of the site you are visiting contains a suspicious mix of characters from different language scripts.

What is IDND?
IDND is a Firefox add-on that pops up a warning message for domain names with a suspicious mix of characters from different language scripts. It provides additional information on the domain name and helps protect against phishing and spoofing attempts.
Users: 48 ▲ 1
Rating: 4.50 (6)
Version: 2.2resigned1 (Last updated: 2024-04-25)
Creation date: 2005-04-25
Weekly download count: NaN
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
  • <all_urls>
  • webRequest
  • webRequestBlocking
  • notifications
  • contextMenus
  • tabs
Size: 21.77K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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IDN's are great for linguistic diversity but can be used for phishing or spoofing, so with IDND, suspicious IDN's cause an alert box to appear, warning you to take care. (This is in no way sufficient protection against all kinds of spoofing, but does add to your browser's defences.)

In addition, you can right click the URL address in the Firefox navigation bar and select IDN to get more information on the domain name (whether/where the domain contains international characters).

Finally, some users may wish to right click the navigation bar itself, choose "customise..." and then drag the IDND icon to beside the URL address. This icon changes green/blue/red depending on the nature of the domain name, it tells you whether you are visiting a Traditional Domain Name (green TDN) or an International Domain Name (UN-blue IDN) or an IDN suspicious domain (red).

User reviews
I love the idea, but the icon is not changing color on Firefox 66.0.3 and I can't find a place where to file a bug report.
by Ilario Gelmetti, 2019-04-26
View all user reviews
Risk impact

IDND is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install IDND if you trust the publisher.

Risk likelihood

IDND is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

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