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Every time I visit Salon.com after a restart of my computer, I get a pop-under from something called c1.zedo.com, carrying a flash advert (which may be anything, but has recently been American Express, and now is something about Darfur) on behalf of a client called UnderertoneNetworks.com. I tried adding a line to my Firefox browser's about:config page, to black flash pop-ups, which apparently used to defeat Firefox's pop-up blocker, but that hasn't affected it.