Add duck duck go with dark theme and safe search off Show more
Go to http://mycroftproject.com/search-engines.html?name=https%3A%2F%2Fduckduckgo.com%2F%3Fkae%3Dd%26kp%3D-2
and click on link, it should add it as new search engine, then go to settings on your browser and choose it as default search engine.
