该版本在视觉效果上做了不少改进，以及修复了一些bug。

下载地址： http://ftp.gnome.org/pub/GNOME/sources/gnome-shell/2.91

Changes since 2.91.1
====================
 * Use GNOME 3 WM theme by default [Jon McCann]
 * Add general keyboard focus support to the Shell Toolkit [Dan]
 * Support new notification spec 'action-icons' to turn on icon buttons.
   [Jonathan Matthew]
 * Pay attention to the distance the mouse has moved from the
   message tray when deciding how quickly to hide the tray [Hellyna]
 * Change magnifier defaults to be full screen [Florian]
 * Fix creating many one-shot Clutter materials and compiling many
   shader programs per frame [Neil]
 * Visual tweaks [Adel, Dan, Jon McCann]
 * Bug fixes [Florian, Giovanni, Owen]
 * Build fixes [Dan, Florian, Jon McCann, Mathieu]