@Cookies4Lunch: I love DDG, can't live without it, but inside Safari and not as an alternative to Safari. I think Safari and macOS (OSX), completed by Cookie 6 and Minim Safari extension, is the most secure browsing environment at all. And DDG works smoothly and full-featured as a simple website inside Safari. So, to make a long story short: I think, there's no need to use DDG as a separate browser on macOS (OSX). Just take Safari, Cookie and Minim – and your'e on the safe side.