UNMAINTAINED
GNOME Shell extension. Supports GNOME Shell 3.6.
Extension page: https://extensions.gnome.org/extension/530/alt-tab-mod-only-raise-activated-window/
Github: https://github.com/dsboger/gs-ext-alttabmod-raise-activated
When you Alt+Tab to an app (instead of Alt+ to a window), default behavior is to bring up all windows of the selected app and activate the most recently used. This extension modifies Alt+Tab to always bring up only the activated window.
OBS: not guaranteed to work together with other extensions that also modify Alt Tab popup. Tested only with 'Alt Tab Workspace' [1] and other 'Alt Tab Mod: ...'.
[1] https://extensions.gnome.org/extension/310/alt-tab-workspace/