The 'Speed Dial' page is pinned on June 2012's release of Firefox 13. To try it right this very second you can install the Firefox Aurora build. This can be done via the official Firefox Aurora PPA (supporting Ubuntu 10.04 – 12.04) but it will overwrite your existing Firefox installation.
To install Aurora Firefox version open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
Here is the Firefox Aurora Homepage, That's it