Excellent Rated 5 out of 5 stars
It provides the most handy and logical way to use a search "plugins". I mean 1) you don't need to configure an engines separately like in SearchWith (IIRR) or something like because all engines you need already here in the browser and 2) you don't need to dig through a very long submenu like a good old ContextSearch when here is a lot of engines while most of them used only occasionally.
The last (Jul 31 2011) version works perfectly -- even with a some nonstandard search engines added via "Add To Searchbar" even without favicons.
I'm not experiencing any problems. Maybe you could mail me the content of your about:support?