I recently had to do a clean reinstall of Firefox so I lost my history. I was accustomed to just typing "f" and getting Facebook as my first suggest site. Now it's the second choice, and I don't know how to move it back up to the first. Is there any way to manually adjust the "suggested site" feature of Firefox?
In your case, I think a better solution would be use a bookmark keyword.
Now you can quickly load a location (regardless of history) by just typing a keyword!
Video Demo: http://www.youtube.com/watch?v=cKW9Vy-vHQ8
With the cursor hovering over the site in the drop down list, simply press the delete key to remove the suggested site