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Sidebars List
Adds drop-down list to switch sidebars in Firefox...
Flat Bookmarks
A different way to view the Bookmarks and History sidebars...
All-In-One Sidebar
Quickly switch among sidebars, and view dialog windows for downloads and extensions....
MultiSidebar
Firefox extension that enables you to use multiple sidebars simultaneously in your Firefox browser...
multiple Firefox extension firefox Firefox Collection sidebar