This add-on restores squared tabs, the application button with application menu (known from Firefox for Windows), the add-on bar, bookmarks/history menu/sidebar buttons and other buttons. Users of Debian 9 or later and Ubuntu 16.04 or later: apt-get install xul-ext-classic-theme-restorer What happened to my legacy add-ons on AMO and where to get them now?Ĭlassic Theme Restorer supports Firefox, Waterfox and Basilisk browser versions 45.x-56.x! (No support for Fx 57+ or Wf 68+!)