Block internationalized domain names (IDNs) is a free Chrome extension developed by Jiri Pospisil. As the name suggests, this add-on automatically blocks all requests to hostnames that contain IDN labels.

With the increasing use of internationalized domain names, it is important to ensure the security and authenticity of websites. This extension provides a simple solution by preventing access to websites that use IDNs. By blocking requests to these websites, it helps to protect users from potential phishing attacks or other malicious activities.

The extension is easy to install and use, making it accessible to both novice and experienced users. It runs seamlessly in the background, without causing any noticeable impact on browsing speed or performance.

Overall, Block internationalized domain names (IDNs) is a useful tool for anyone concerned about online security. It effectively blocks requests to websites using IDNs, providing an added layer of protection while browsing the web.