AFAIK they don't. Firefox phones home to mozilla and according to this comment has about 20 default settings phoning home to google[1]. But my point was simply

AFAIK they don't. Firefox phones home to mozilla and according to this comment has about 20 default settings phoning home to google[1]. But my point was simply about directing users' searchs to google search engine, which is enough to expose yourself to google. [1]: https://news.ycombinator.com/item?id=14809837 https://news.ycombinator.com/item?id=14809837