Rated 4 out of 5 stars

It seems useful. In 5 minutes you don't really have much chanve to test it properly. ;)
Right now it's at least promising.

@Wraithofwind: Locally, I guess, based on that Mozilla didn't scrap dedicated search bar in order to keep search suggestions in the UI but not have every URL and character sent of to Google.

This review is for a previous version of the add-on (5).