How can I hide an application from the alt-tab menu for Unity?
An older post suggested using compizconfig-settings-manager.
Install compizconfig-settings-manager:
sudo apt-get install compizconfig-settings-manager
Go into Window Managment and Window Rules, there add:
Skip taskbar: title=Cairo-Dock Skip pager: title=Cairo-Dock
and finally go back to the main settings and enable the Window Rules by checking the box
However, in compizconfig-settings-manager for 14.04, there is no Window Rules option.