Auto Dial is cool firefox add on which lets you see the most frequently visited websites every time you open a new tab. It shows you the recently visited sites mesh with 3D parallax effect.
However the first run sucks as it depends on your firefox history, would be really cool if you surf for a lot on web through firefox.
On the first run it takes around 30 seconds to populate the thumbnail preview of the web pages and sites you have previously visited.
Note: Auto Dial is an experimental add on so you will need to register with Mozilla to download and install the extension.