Excellent! (but minor fixes needed) Rated 5 out of 5 stars

This addon is superb. But there are few things that bug me:

* Typing in the omnibar is accompanied by annoying flickering of the dropdown suggestion box itself as it updates. It doesn't resize smoothly like the Chrome's omnibar.

* The suggested URL is "@Google " (instead of just the entry itself "", which is more convenient in my opinion, because the description itself implies that already: "Search Google for ").

* The first and the last suggestions of a search are always the same. For instance, if I type "bla" then I'd get:

bla (search Google for bla)
@Google bla (search Google for bla)

Other than that, it's just brilliant. Good work!

This review is for a previous version of the add-on (0.2.3b). 

Some good points and suggestions

> flickering of dropdown suggestion box
Flickering is more apparent when using this addon. You could try "slimmer" suggestion box styles and see if it reduces flickering. This may improve with even faster Firefox coming in the near future.

> search queries prefixed with "@Google "
In general you could type in any search engine name e.g. "@Yahoo " (different from your default search engine). Of course, it may be omitted when you have "default search" enabled and haven't explicitly specified a search engine name.

> duplicate search options in suggestion box

I could not simulate this with default settings. Can reset your settings and see if the same behavior is present?