[wongarsu]

> when you go to раураӏ.com that last character shows up in red.

All of them would show up in red, all of them are cyrillic. If all but one character was cyrillic, Firefox would detect this and render the url in punycode. As implemented now, firefox renders the URL as shown because all characters are from the same script (~character set). Chrome is more suspicious and renders it in punycode (https://xn--80aa0cbo65f.com/), though it would presumably render the confusing version if my locale was Russian.