Rewind Fastforward Buttons adds two new buttons to the Firefox toolbar - Fast forward and Rewind.
These are complemented by the classic Back and Forward buttons which only skip through at a page at a time. While they return to previously visited pages, Rewind leads us to the last page, which may or may not be hosted on a different domain than your current page. So for example, imagine that you are watching a video on YouTube. then Softonic's homepage, and then the Softonic program page. If you hit back, it jumps immediately back to Softonic's homepage, but if they hit "Rewind", it takes you all the way back to YouTube.
A simple but hugely effective program that saves you time browsing.