Rated 5 out of 5 stars
Indeed, the Awesomebar! One of the finest Firefox add-ons available. Three words: Search engine keywords! Compatible with Firefox 4 (Beta 2) when combined with Mozilla's excellent Add-on Compatibility Reporter add-on.This review is for a previous version of the add-on (0.7.0.20100707).
To be updated soon
There are some changes that need to be made before it can be made compatible with Firefox 4.0b2. I will be releasing a new update very soon, hopefully by weekend.