>On 6 October 2017, Mozilla announced a test where approximately 1% of users downloading Firefox in Germany would receive a version with Cliqz software included. The feature provided recommendations directly in the browser's search field. Recommendations included news, weather, sports, and other websites and were based on the user's browsing history and activities. The press release noted that "Users who receive a version of Firefox with Cliqz will have their browsing activity sent to Cliqz servers, including the URLs of pages they visit," and that "Cliqz uses several techniques to attempt to remove sensitive information from this browsing data before it is sent from Firefox."

https://en.wikipedia.org/wiki/Cliqz#Integration_with_Firefox