Yahoo's Firefox deal risks dropping into the red

Yahoo's annual payments of $375 million to Mozilla for making the search provider Firefox's default in the U.S. increasingly looks like a bad deal for Yahoo as Firefox's user and usage shares continue to contract.
According to documents filed with the U.S. Securities & Exchange Commission (SEC), Yahoo paid Mozilla $375 million in 2015, and is obligated for the same amount each year through 2019 under a five-year contract.
Yahoo's annual payment was about $100 million more than Google paid M