I went through the process of adding duckduckgo in the firefox browser but from the directions. It seems to cumbersome to go through it. I found that i went to about:preferences#search in firefox and the addon was already loaded from midori, and just selected it on firefox, since i had the bodhi 3.0 version of bodhi from the box.
Just thought we should add that somewhere. ( Maybe it was already put out there?)