Want to have the power of your bookmark collection right at your fingertips? SiteLauncher will allow you to assign keyboard shortcuts to all your favorite bookmarks.
To launch, all you have to do is hit Ctrl+Space (or for the Mac users Ctrl+Alt). If you want to use it without the graphical launcher above, use Shift+Alt (or Shift+Ctrl for the Mac users).
Some of the best features include the ability to customize the appearance, set the launcher to open in current or new tabs, set the launcher up as your homepage and you can add as many sites to it as you need to.
You can get more information about it via the official web site, and download it via the Firefox Add-ons site. It is nice to see a good looking and well thought out extension – and this one fits the bill.