If I'm honestly, I don't like your DDG search bar for safari, cause it has a big display bug so the bar itself are cluttered all around the bar.
Instead, I really like Glims and how it replaces Google with DDG in the search field integrated in Safari. What I noticed is, that the Favicon didn't update. Even if I readded DDG to the search engine. I don't know if this belongs to DDG or Glims.
BTW: Still absolutely awesome search engine!