Although Google Toolbar is not suppose to work with the latest Firefox version, I manage to keep it there. Until recently when I would open a new tab, I would have New Tab King there - most visited sites etc. But now when I open a new site, I have Google most visited there which actually don't show anything. I have tried most of the solutions listed online such as going to about:config and resetting new tab there. But nothing seems to work. Also, I have the same setup (Google Toolbar, New Tab King and all the other add-ons) on two other pcs and it works just fine, and was working fine on this one until recently.