Skype-Integration in Gnome3 / Fedora 20. with a visible state icon on the topbar

I already found this extension some time ago and attempted to install it
in $HOME/.local/share/gnome-shell/extensions/

During that time I didn't get the extension visible.

Today after starting the Debug-Tool LookingGlass lg with <Alt>-<F2>, the
Extension tab showed this extensions.

Now after starting gnome-tweak-tool an enabling the skype-Extension, I got
the state-symbol.