Belongs in FD Docs, but I read NOT TO POST ANYTHING THERE, so:

Using Fast Dial like Google Chrome (Most Visited sites)

What You need:
Fast Dial 2.14+(NOT 2.11, so if you got Fast Dial from Mozilla Addons, reinstall it from the link provided) Fast Dial 2.14+ are the only versions that supports different folders.

Presetup:
If you haven't already, see this post on how to disable the toolbar autohide brought on by Fast Dial 2.14. Or, if you would prefer, simply use the autohide.

Setup:
On the Main Bar (File, Edit, View, History, etc.), click on Bookmarks, then click on "Organize Bookmarks".

Navigate to the place you have the "Most Visited" folder, and right click on it. A Right-Click menu will open up. Select "Make this my Home Page".

The theme in this picture is Chrome Package.
This package installs two things.
They are:
Topper- Use this with any theme to move the tabs to the top of the window.
Chromifox Adapted- This theme is meant to look like Google Chrome.

Need clarification?
Ask in the comments!