http://spywarcbzke2e6skl7wjwtmmnrkslue24cld6kfcufjhhwxtceogmuad.onion/articles/firefox.html
If they really cared about your privacy, the default search engine would be StartPage (which gives the same results as Google, but anonymized) or DuckDuckGo. Can be changed through the GUI. Pocket — a privacy nightmare Firefox has a Pocket button in its navigation bar, which allows you to "save any article, video or page from Firefox" and "View in Pocket on any device, any time."