Put an end to naked new tabs with this very useful new addon for Firefox called New Tab King. In the words of the developer
New Tab King is a browser add-on that’s available for you when launching a new browser tab. Instead of getting a blank page (or the Homepage in some cases), New Tab King provides you with your most visited sites as well as the sites you bookmarked on your own. Both these lists are ordered from most to least vested in the past 30 days. Each site is displayed with its description text and the website’s icon.