Fast Dial is a Firefox addon which replaces blank tabs with a panel of thumbnails of your favorite sites.
Ways to open Fast Dial(FD) page:

• Open a new tab (press Ctrl+T).
• Close all tabs. FD will be displayed in the last tab standing.
• Set about: blank as your home page address.
• Add FD toolbal button to your toolbar.

• Firefox: 3.0 – 3.1b1pre