Firefox now has a new quick dial page like Chrome and Opera. It shows thumbnails of frequently visited pages. However, for some of my pages, the thumbnails are grey (most notably Facebook, and Google sites). I believe this is because they use SSL, and this was recently changed to not display them as a security feature.
Is there a way to make these sites display as thumbnails again, regardless of SSL? Or alternatively, is there a way to customize the thumbnails (like a static logo, or cooler, dynamic tiles like Windows 8 does)?