In the current Firefox release there is no longer the Add-on Bar. If you have an extension that uses the Add-on Bar then you need to restore this toolbar with an extension like Classic Theme Restorer. * https://addons.mozilla.org/firefox/addon/classicthemerestorer/ *https://support.mozilla.org/kb/what-happened-to-the-add-on-bar See also: *https://support.mozilla.org/kb/how-to-make-new-firefox-look-like-old-firefox *https://support.mozilla.org/kb/common-questions-after-updating-to-new-firefox *https://support.mozilla.org/kb/learn-more-about-the-design-of-new-firefox