It was very useful for changing default engine, but it is broken now Rated 5 out of 5 stars
It would be very nice to return an ability to change current search engine using an icon in the location bar. It seems that there is no alternatives for this feature.
UPD: I'm using Omnibar Lite now: https://addons.mozilla.org/en-US/firefox/addon/omnibar-lite/
Rated 5 out of 5 stars
The best addon :) Please add ability to add custom search engines.This review is for a previous version of the add-on (0.7.17.20130121.1-signed.1-signed).