All in One Sidebar 0.7.11
All-in-One Sidebar (AiOS) is a sidebar control, inspired by Opera's.
Click on the left edge of your browser window to open the sidebar and get easy access to all your panels. It lets you quickly switch between sidebar panels, view dialog windows such as downloads, add-ons, and more in the sidebar, or view source code or websites in the sidebar. It includes a slide-out button and a toolbar, all of which can be extensively customized. All-In-One Sidebar provides also enhancements for many built-in and extension features and some extra features.
Firefox 3.0 or higher required.