Taboo is an extension for the Mozilla Firefox browser that makes sure you don't leave any link without visiting. For this it uses a list of "not visited pages" that you can manage in different ways.
One of them is the miniature view, where you will see miniatures of the pages you still have to visit. Another one is the date view, similar to the one before, but with the pages embedded in a calendar, according to the date they were added to the list.
All of this makes Taboo an excellent navigation tool that is worth installing.