Once installed, the extension adds an extra ‘Faster’ button to Google’s home page. Perform a search and click it (or hit Enter), and Faster works its magic, putting the search results in the left-hand bar and automatically loading the top result in the main window. (You can still access regular Google search by clicking the search button.)
How useful this is depends on what you’re doing. If you’re trying to locate a specific site, the sidebar is a bit of an intrusion, but if you’re aiming to work through a range of results, it can be more appealing then endlessly opening in new tabs or doing the backspace shuffle. One niggle: we found the extension had difficulty rendering some sites (including Lifehacker’s front page). Faster is free, works wherever Firefox does.