Fixing the IDN problem in Mozilla

Most people will have come across the IDN vulnerability in Mozilla and other browsers, where www.pа was registered, with the first “a” actually being a Unicode character, а, that looks like an “a“.
I think Mozilla should fix this by displaying non-ASCII characters in the Location bar in red. So http://www.pа would actually look like http://www.pа This isn’t unfair to non-ASCII users, since their URLs won’t look weird; an entirely Russian URL would be entirely in red, and therefore wouldn’t stand out.

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