First, Mozilla started to collect your search data in Firefox, promised to "not sharing anything with 3rd parties". Ok.
Mozilla, moments later, just aquired the advertising firm "Anonym"[1], which is now technically not a 3rd party anymore.
#Mozilla is now becoming an advertising company, using your search data (no matter which search engine you use) to feed their pockets.
Face it: Firefox, built mostly by volunteers, is now owned by an advertising company. Sure has nothing to do with their yearly CEOs salary raises?