Universal Back Button (UBB) is a simple app that implements a back button that in principle "works everywhere." The idea is to provide a back button that takes you back to the task you were working on, before you opened a file, clicked a link, or similar. The app appears as a small menu-extra in your menubar; click it once to go back (after following the installation guidelines when you first open UBB), or double-click to open the menu and configure UBB's settings.
Mac OS X 10.6
Mac OS X 10.6 Intel
Mac OS X 10.5 Intel
||Snow Leopard (Mac OS X 10.6) or later.