$ gsettings get org.gnome.shell enabled-extensions

['apps-menu@gnome-shell-extensions.gcampax.github.com', 'places-menu@gnome-shell-extensions.gcampax.github.com', 'window-list@gnome-shell-extensions.gcampax.github.com']

gsettings set org.gnome.shell enabled-extensions "<output_of_earlier_command_listing_enabled_extensions>"

gsettings set org.gnome.shell enabled-extensions "['apps-menu@gnome-shell-extensions.gcampax.github.com', 'places-menu@gnome-shell-extensions.gcampax.github.com', 'window-list@gnome-shell-extensions.gcampax.github.com']"

$ chmod +x ~/bin/enable_gnome_extensions.sh