Few weeks back Google had launched the instant search for its search engine, where in you get instant results when you type in the search keyword. If you liked instant search, you can now get instant search powered by Google on Firefox. InstantFirefox is a nice add-on for Firefox which brings Google-Instant-like search to Firefox. The instant search is available when you type in any word in the Firefox address bar.
Once installed, whenever you open a new tab, you get a search window, where in you can type any keyword in the address bar and the results are shown instantly in the window.
Here is a short video of the add-on in action.
Instant Firefox is a nice add-on which brings in instant Google search to Firefox.