When enabled the first starting position of any application window shall be in the center of the current screen. NO LONGER UPDATED! If you have 3.14 or higher gnome-shell, then using dconf-editor go to /org/gnome/mutter/, and check 'center-new-windows'.
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
An important typo fix: workspaceAddedId - > workspaceAddedId
Place Windows In Center