TabNavigator combines the MS Windows style window navigation (small icons with name of the application) with the form of navigation found in Ubuntu (preview of the windows as you browse).
The default shortcut is alt+r.
(since v1.0.1, you can go back in the list with alt+w)
Use the add-on options to select enable/disable tab preview and to customize the appearance.
The more you are addicted to alt+tab the more you will like this add-on :)