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When opening a new tab in Firefox, I see no thumbnails:

It's exactly what is described in this ghacks post (see the photo), but taking the steps they say does not solve the problem. I don't erase cache nor history, nor any other external tool does it.

This happens to me in Fedora 17 and Windows 2003 Server, since I use Firefox 13 (previous versions did not have this feature).

How do I make it work?

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