Since Sleipnir is absent from DuckDuckGo’s list of browsers that include it as a search option, I wanted to share how to add DuckDuckGo to Sleipnir’s Search/Address bar as a new search service. It’s quite fast and easy.

1. Open Sleipnir’s Preferences and go to the Search tab.
2. Click Add.
3. A pane will drop down. In the Search Service text field, enter DuckDuckGo. In the Address field, enter https://duckduckgo.com/?q=%@. In the Search Shortcut field, enter the shortcut you prefer (I used d). It should appear as follows:

Unfortunately, DuckDuckGo can’t be added to the options available in the Web Search drop-down menu (as usual, they are Google, Yahoo and Bing), but once you add DuckDuckGo as a search service, performing a search from the browser’s Search/Address bar is fast anyway — you just enter the shortcut followed by a space and the search keyword(s). (For example: d apple)

Even better, once you add a search service in Sleipnir, the application assigns a keyboard shortcut to it (⌘-4 in my case, as you can see in the figure above), so when you press that keyboard shortcut, Sleipnir will open the DuckDuckGo main page a new tab.