Google's grip on the Internet search market loosened in December, as the search engine saw its largest drop since 2009. That loss was Yahoo's gain, as the Marissa Mayer-helmed company added almost 2 from November to December to bring its market share back into double digits. According to SatCounter Global Stats, Google's lead remains overwhelming, with just more than three-quarters of search. Microsoft's Bing gained some momentum to take 12.5 of the market. Yahoo now has 10.4.