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http://www.fahad.com/pics/foxtab.jpg
http://www.technasity.com/wp-content/uploads/2009/03/foxtab2.png
http://www.firefoxfacts.com/wp-content/uploads/2008/09/foxtab2.png

FoxTab is a popular 3D tab management extension.
FoxTab powers Firefox with the following main features:
  ✔ Top Sites (aka Speed Dial) for quickly accessing your favorite web sites
  ✔ Tab Flipper – to easily flip between opened tabs using mouse or keyboard gestures
  ✔ Recently Closed Tabs – for reopening a tab that was recently closed

Choose between 6 attractive 3D layouts.
Customize the way FoxTab looks with a set of predefined themes or by creating your own customized one along with Personas.
Download: https://addons.mozilla.org/en-US/firefox/addon/8879

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That actually, looks really cool.