1st way:

It is worth noting in Fast Dial that there is a sort option for the cells that has existed for a long time that cells can be sorted to show the most visited sites.

right click on fast dial page, chose sort and then visited:

2nd way:

As well as the above it can be noted that if one goes to Firefox Bookmarks/Orangise Bookmarks that it is possible with the right click context menu to select Fast Dial Make Home.
Using this feature it is quite a simple matter to chose for example to chose the most visited folder.
If that bookmarks folder is selected one is in the most visited folder of Bookmarks. So it is under bookmarks control.
If one wishes to return to the Fast Dial folder then right click on the Fast Dial folder in Bookmarks (in bookmarks menu) and make that Folder Home.
Once that is done all the stored cells and logos of your personalized Fast Dial will reappear.

Most Visited Folder in Fast Dial:

Fast Dial Version 4.2.1 switches by default to about:blank (which Fast Dial uses).

This was a necessary change otherwise Fast Dial in Firefox 13 would no longer run as the previous default new tab page(about:blank) had been replaced by Firefox's New Tab Page (about:newtab).

This tutorial shows how to successfully control your new tab page using Tab Mix Plus.

Starting with Firefox 12, TMP's default for "Load on new tabs" option changed to New Tab Page.
When you update Firefox to v.12, it resets the TMP option to New Tab Page and you have to make your selection again.
You have few options if you had the Blank Page option selected previously:

* use the New Tab Page for new tabs.
* use the New Tab Page but disable it by clicking on the button on the upper right corner,
this will turn the New Tab Page into blank page for new tabs.
(or setting browser.newtabpage.enabled to false)
* set Tabmix to load Blank Page.
* set Tabmix to load New Tab Page and set the address to about:blank.

This change in Tab Mix Plus is good to be aware of, but it will not effect users of Fast Dial 4.2.1, as Tab Mix Plus respects and acknowledges the settings made by Fast Dial 4.2.1 and does not endeavor to override them.
This is good news.

So the default Tab Mix Plus settings are these:

However if Fast Dial Version 4.2.1 is loaded into Firefox these will be the settings seen in Tab Mix Plus

In summary, to keep Fast Dial the way it was before Firefox 13, don't change anything in Tab Mix Plus settings or in Fast Dial's settings.

However, if you want to have the New Tab Page(or blank page) open in a new tab(not Fast Dial), just deselect the option in Fast Dial's settings

to "Show Fast Dial in new tabs" then you can control what you want the new tab to be in Tab Mix Plus's settings as described in the screenshots

above.

Note: To make Fast Dial act like Firefox's New Tab Page, check out this tutorial: http://userlogos.org/node/15549