Apparently I was misinformed.
»addons.mozilla.org/en-us/firefox ··· /427598/
by Abine, Inc., the online privacy company (Developer) on February 4, 2013 Â· permalink
We're continuing to support Googlesharing and maintain its original proxy server written by Moxie M. We are also going to re-write the server and improve the service. The exact timing of this is still a TBD. Please contact us by email if you want to a) help out or b) want further information.