Mozilla and Yahoo sue each other over default search engine deal

Deals between web browser suppliers and search engine providers are big business. For Mozilla, agreements with search engines have brought in as much as US$300 million a year, which accounts for 90 percent of its income. So the stakes are high amid the latest tech company quarrel, which sees Mozilla end its partnership with Yahoo due to claims it hadn't been paid. Neither party is happy with the situation, so they're suing each other. Back in 2014 Mozilla and Yahoo struck a deal that would see Yahoo act as the default search engine in Firefox through 2019.