"Across the board, the average IQ scores presented for users of Internet Explorer versions 6 through 9 were all lower than the IQ scores recorded for Firefox, Chrome, Safari, Camino, and Opera users. Humorously enough, those using Internet Explorer with the Chrome frame built-in actually ranked third in IQ scores among this browser list. Opera users reported the highest average IQ score – hovering around the 120 to 130 range, which is a bit higher than the WAIS test's population mean of 100 (and standard deviation of 15). "
These findings go along with my own study..."
Link to Original Source