In the Firefox 13, Mozilla added the new tabs homepage.
The New Tab page now opens whenever you click on the '+' sign, allowing you to see thumbnails of your most recently and frequently visited sites. You can customize the New Tab page by adding or removing thumbnails based on where you go most.
Is there a way to add specific pages to this tabs page? Currently I'm removing tabs as they appear and it would be better if I could add the specific ones I want.