Yesterpage is a browser extension that maintains a "tree of history". This is a visual representation of all the pages you have been, showing where you arrived from, and where you are going. This functionality is not found in the default browser, but it can be enabled in various browsers, such as Chrome and Firefox. In this extension, it is maintained in a treeview, with every page you have ever visited listed in a tree. This means that, if you proceed to another website, the previous pages that you have seen will be preserved for later.

The primary difference between yesterpage and other extensions is that it does not just provide an expanded back/forward functionality; it also keeps track of every single page you have ever been, in a tree view. So, if you browse to another page, it will be listed in the history tree.