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I accidentally clicked the X button on one of my pages in the new “Speed Dial” tab page in Firefox.

How can I undo this operation? I'm fine with editing a config file or SQLite database in my profile, I just need to know where to make the change.

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See my answer here. – avirk Nov 12 '12 at 16:24

Add desired site to bookmarks, then open bookmarks panel and use Drag-n-Drop to move your site to Speed Dial screen.

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