Firefox 2.x
Firefox 3.0
Windows
Mac OS X
Linux
"All-in-One Sidebar is a Firefox add-on that turns your sidebar into a centralized hub for some of the browser's main features. These include your add-on control panel, download manager, source code viewer, bookmarks, history, as well as detailed site information. AiOS not only clears up valuable space in your browser window but simplifies accessing vital aspects of Firefox's functionality. The behavior of the sidebar itself becomes customizable, and many of the aforementioned features are actually enhanced with AiOS. An added bonus is the ability to place custom toolbars in several areas of your browser window."
"All-in-One Sidebar (AiOS) is an award-winning sidebar control, inspired by Opera's. It lets you quickly switch between sidebar panels, view dialog windows such as downloads, extensions, and more in the sidebar, or view source or websites in the sidebar."
