Rated 5 out of 5 stars

It's just another search engine on the search bar, but definitely a MUST HAVE.
This is the first thing I install on every new Firefox profile.

As a side note: a feature I would like to see on the Mycroft Project Website is some way to quickly add a bunch of predefined search engines, or at least grouping them so one does not need to search for and add each one by one.