This is the eighth in a 10 part series of Top 10 Firefox 2 Add-ons. If you have missed the earlier seven, here are the links:

Part 1 - FoxyTunes
Part 2 - MR Tech Local Install
Part 3 - ForecastFox
Part 4 - IE Tab
Part 5 - StumbleUpon
Part 6 - Tab Mix Plus
Part 7 - Download Statusbar

The next in our line is All-In-One Sidebar.

All-in-One Sidebar is a sidebar control, inspired by Opera's. It lets you quickly switch between sidebars, view dialog windows such as downloads, extensions, 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 also provides enhancements for many built-in and extension features and some extra features.

Firefox users who get accustomed to this wonderful extension rarely go back to the clunky default Firefox add-on window. From one clickable and customizable sidebar, you can access your history, bookmarks, downloads, plug-ins, and Web-development tools, as well as an endless amount of content via other extensions.

The latest version of this slick, comprehensive application kicks the teeth out of the Opera browser's sidebar. By making all this extra content available via the same sidebar window, it takes one click on the sidebar's menu to switch among them, minimizing the clutter multiple Firefox extensions can unfortunately create. By default, the sidebar appears as a narrow panel of icons on the left of the screen, but even that can be set to automatically collapse into a thin tab that expands when moused over. Complete, well-designed, and enormously helpful, All-In-One Sidebar ranks among the most useful extensions we've seen.

Version 0.7 includes many new localizations and automatically show/hide the sidebar.

Click here to download All-In-One Sidebar 0.7.