"Firefox developers say they're close to plugging an information
leakage hole that has plagued every major browser for more than a
"The cascading style sheets history attack makes it easy for web
masters to compile vast lists of links visitors have previously
viewed. It exploits technology in virtually every browser that
causes visited links to be displayed in purple rather than blue.
Mozilla has classified the weakness as a bug since at least
"But fixing it has proved to be a vexing problem, largely
because programmers didn't know how to close the hole without
breaking key web functionality."
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