This works as advertised, unlike the original. Thanks, Jett.

This is PERFECT! Finally I have a way to KEEP Google as my default search engine, but I can also quickly search from DuckDuckGo without having to navigate to it! Why the OFFICIAL DuckDuckGo add-in removed it's search-box is beyond me! Thank you for restoring this (Plus having many of the Bang option listed/selectable is very helpful).

The reason this is so important and amazing is:
FireFox removed the ability to have your Address-Bar and Search-Bar use different search engines... this gives me back that functionality - Something the original DuckDuckGo add-in did, but no longer Does! Jet is my hero!