Recently, the Shmoo Group discovered that Firefox is vulnerable to precisely the exploit that i predicted in my 2002 paper—Ping

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By this logic we should stop using language!—Ian

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It seems feasible to me to choose (or design) a font that would make all of the 7-bit printable ASCII characters clearly distinguishable.—Ping

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Render non 7-bit printable ASCII characters in a different color. Or with a different color background.—Mike

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What happens if the character set includes the full set of—Ian

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Only "paypal" would have a purple background, not the entire URL bar. That would look considerably more odd than the entire URL bar background switching to light yellow for https. Why would anyone complain about Firefox’s yellow https URL bar, and why are you certain that you would have heard about it if they had?

My suggestion doesn’t help people who want to visit non-P7ASCII domains.—Mike