gnome 3 extensions install fails silently

[Bryn M. Reeves]

Attempting to install the "put windows" extension for gnome3:

https://extensions.gnome.org/extension/39/put-windows/

I get the "Download and install 'Put Window' from extensions.gnome.org?"
dialog and OK it and the extension apparently fails to install
somewhere.

Couldn't find anything obvious (e.g. .xsession-errors) and I've managed
to install a couple of other extensions that are not currently
RPM-packaged in Fedora this way.

Any clues on how to debug this further?

Cheers,