The All-in-One Sidebar (AiOS) is a sidebar control for Mozilla Firefox, similiar to the one that opens in Opera 9.x by clicking on the edge of your browser window. This extension lets you quickly switch between sidebar panels and view Firefox features such as downloads, extensions, bookmarks, addons, etc in the sidebar. You can set the orientation to left or right, set the minimum, default and maximum width and the behavior on browser startup.

Key features of All-in-one sidebar for Firefox include:

+ Open the following items in sidebar: Bookmarks, History, Downloads, Extensions and Themes, Page Info, Page Source, Error Console and DOM Inspector from a fully configurable toolbar.
+ Show/hide sidebar automatically, with additional toolbar button
+ Set the orientation to left or right
+ Sidebar Switch to toggle the toolbar and the sidebar with only one click
+ Sidebar Grippy to collapse the sidebar
+ Sidebar collapsing instead of closing
+ MultiPanel Sidebar - open a website, the source code or different browser information (e.g. about:config) in the sidebar
+ Fully configurable keyboard shortcuts
+ Customize the behavior of the sidebar at startup, in fullscreen mode and more
+ Sidebar and Toolbar buttons
+ Export/import settings from the options dialog for multiple computers
+ Add toolbars nearly everywhere: on the left, right or bottom of the window, above or below the sidebar, below the sidebar header or below the tab bar.

Download All in one Sidebar for Mozilla Firefox here