Rated 5 out of 5 stars

I think that this is a great add-on! It needs a little UI change and a little more customization, but it's a great start. It should become like the new Ubiquity integrated into the Awesome Bar. They should make commands like that of Ubiquity and the ability to add more. They should also allow you to only start typing the first letter then auto select the category. It is easier for me to type "g [space] [What I want to search]" then to type"search: [What I want to search], I should only have to type the "s". If they did that then it would become one of the most useful add-ons in my opinion. Keep up the great work Mozilla!

This review is for a previous version of the add-on (2.1-signed.1-signed). 

v3 better indicates that you only need to type "s[tab]" to activate search. Previous versions tried hinting at that by coloring text blue, but that didn't seem to help as it's out of the view of the user.