How Check DoFollow/NoFollow Blogs

How to check if the blog is DoFollow or NoFollow. This is the very important trick wanted by everyone to check for the dofollow blogs becauase blogs searched from the result of dofollow blog search engines doesn't provide with full satisfying results.So i will give you today one trick to how to check if the blog you like is Dofollow or Nofollow.Just you need is that you are using mozilla firefox