Here are two extensions which can do it. Take any of them you like. --------------------------------------------------- The extension moves sidebar to the right side of the browser. [https://addons.mozilla.org/en-US/firefox/addon /7865 RightBar] -------------------------------------------------------- The award-winning All-in-One Sidebar (AiOS): - places the sidebar on the left or on the right side of the browser and many other features [https://addons.mozilla.org/en-US/firefox/addon/1027 All-in-One Sidebar]