This extension is cool enough to use, but frankly could be a lot better. Among other things, it should ( but doesn't ):
- provide enhanced features to ddg
- add a !Bang drop-down menu
- optionally save search terms
- save filter options
- omit hits from specified domain(s)
- make ddg settings persistent across devices with extension installed 9 via ff account association or otherwise ).
( Extensively tried in Linux & Windows10 ).

But, at least it does enhance my data privacy. Viva la libre!