1
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?