Smart bookmarks folders are saved searches of your bookmarks and history that appear as folders in your bookmarks. For instance, you can create a folder that lists all bookmarks you visited the day before; and it is updated automatically.
Firefox comes with some smart folders available:
If you accidentally delete one of these Smart folders, see Restore the default Smart Bookmarks Folders.
To create a new Smart Folder based on your browsing history:
To create a new Smart Folder based on your bookmarks:
The example below illustrates this process for a Bookmarks folder.
This example illustrates how to make an use Smart folders. Suppose that you have several pages about economics bookmarked and want to create a Smart folder folder that updates automatically each time you bookmark another page about economics.