Gnome shell extensions in Mageia 2 RC

I saw somebody posting that he could activate gnome shell-extensions via MCC. This was in Alpha 2. However in RC I cannot find everything. I tried activating extensions via the gnome web site. This worked but then the gnome tweak tool refused to start up.
Any idea how I can get gnome shell extensions to work ? Did I overlook something ?
Any idea how I can get gnome shell extensions to work ? Did I overlook something ?