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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).
In the status bar a green or blue flag shows whether the current page has a traditional (A-Z 0-9 -) or an international domain name. In this way you have more protection against homograph attacks.