Yahoo is up for grabs, and there are some big hitters trying to get the former champion of search. In an odd twist of fate, the biggest winner in all of this may actually be Mozilla, who stand to reap a billion dollar payday. Recode has discovered a clause in Mozilla’s contract with Yahoo stating that if it doesn’t like who purchases Yahoo, Mozilla is entitled to three annual payments of $375 million through 2019. It’s part of a deal struck by Yahoo CEO Marissa Mayer in 2014, making it the default search engine for Mozilla’s Firefox browser. She couldn’t offer…

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