you can download SearchStatus 1.25 plugins for mozilla. after installation click on Highlight Nofollow links
sound like a very useful plugin. Is there any similar easy way to find about the nofollow links in IE?
This one doesn't show 'external nofollow" properly.... For a way to see all versions of nofollow properly.... check out this post: How to Easily Spot NoFollow Links
Yes you can use this option and when you visit any blog related to you niche try it nofollow option if you don't find anything highlighted than that blog is dofollow and you can post comments on it . This will help you to boost PR .