In January, Paul Haigh downloaded Google's toolbar to dispel annoying pop-up ads. By March, they were back. Google's pop-up blocker, included as part of the Web search engine's popular browser plug-in, "worked fantastically well for about two months, blocking everything," said Haigh, a photographer from the United Kingdom. "Then the odd pop-up started to appear, mainly on highly ad-displaying sites based in the United States."
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