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PunyCode Domain Detection is a Firefox add-on (desktop and Android) that stops look-alike web addresses before they open: аpple.com with a Cyrillic а, mozılla.com with a dotless ı, paypa1.com with a digit one. The address is checked before the request is sent, and a full-page warning stays until you decide: go to the real site, go back, or open anyway. The look-alike letters are highlighted and explained. Legitimate international names such as münchen.de are not flagged. Detection follows the Unicode security data (UTS #39) and protects 222 commonly phished sites plus your own. Everything is checked on your device: no network requests, no data collected. Manifest V3, MIT.
Features
- Stops look-alike addresses before the page loads
- Full-page warning that stays until you decide
- “Go to the real site” in one click
- Highlights and explains the look-alike letters
- Mixed alphabets and whole-script look-alikes (UTS #39)
- Imitations of 222 well-known sites and your own
- Plain-letter tricks: paypa1.com, rnicrosoft.com
- Legitimate international names are not flagged
- Panel with a manual link checker
- Three protection modes, trusted sites
- Firefox for Android: touch-friendly warning and panel
- No network requests, no data collected; MIT
Project Samples
License
MIT LicenseFollow PunyCode Domain Detection
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