Link Of The Day: DoFollow
May 27th, 2008 | Author: ChipNoDoFollow is a simple firefox extension that highlights the links on the page, color coded according to their follow status. The extension installs into your tools and right click menu and highlights the links pinkish red for nofollow, and light blue for dofollow.

Right, I also installed that firefox extension. And it works well, I can identify the nofollow links.