If you like knowing what's coming next without actually clicking on a link, there are a few extensions for that purpose:
The first I remember of this genre is
Google Preview which enables thumbnails on google search pages.
Then came
Cooliris Previews which produces a pop-up screen where you can go forward and back (and other things) with only hovering over a link and never leaving your page.
Recently released is
Interclue for Firefox which is a similar tool to Cooliris but appears to have more functions.
All that info and never having to leave the original link!