For the previously mentioned paper, I created a small Firefox extension called SemanticLinks. The purpose? Showing VoteLinks, rel=”nofollow” and information about the linked resource by appending a small icon near the link text (anchor text). SemanticLinks is a simple change of TargetAlert to which I just added a 1%. You can find more information about SemanticLinks and how to install it on the SemanticLinks page. You might also want to see some screenshots.