How do I manually add sites to Firefox's Speed Dial?

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http://askubuntu.com – Firefox now has a Speed Dial you can use in its New Tab page, and it automatically populates it with sites that you visit often. These can then be pinned in there if you always want them visible. But suppose I don't want to wait for a site to show up in there before I can pin it. Is there a way to manually enter a URL that I want to show up in the Speed Dial? (HowTos)