One of the best add-ons - awesome Rated 5 out of 5 stars
At first I didn't know what to make of it. I don't know why since it is very easy to use. But I stuck with it and then I realized how powerful it really is.
It has basically taken the place of my bookmarks. It's easier to use and more "visual" than fetching bookmarks from all over the place.
Set it as your default home page and you can create several pages of links according to your needs. This is a must have for anyone using FF.