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IDN-Warner

IDNs are can look similar to well-known domains and therefore allow users to get fooled, for example https://www.xn--80ak6aa92e.com/.

This addon shows an icon in the addressbar, if a subdomain or the main domain name is an IDN, independent of the way Firefox shows the URL.

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If the second-level domain is an IDN, it shows an red icon If another part of the domain is an IDN domain (3rd level or deeper), the icon is orange