You probably know by now that certain apps track your data and usage patterns while other service providers make your privacy the priority. To update your default search settings on the mobile version of Firefox, select Settings, then Search, and click one of the options there. DuckDuckGo is a popular option for many users because of its privacy protections. If you have another favorite, navigate to it from the Firefox browser, click its search bar, and hold down. You can then add it to the list of search engine default options.