Rated 5 out of 5 stars

We need to save this addon as a community!!!

I would have fixed this by now if i knew how to code better! So github it??

Looks like google officially deprecated the old ClientLogin api.
as shown here

google now uses the new OAuth2 API and new API files.
as shown here

and just peaking into the gmcont.js file is see the following code for one...
var feedUrl = "https://www.google.com/accounts/ClientLogin";

i guess we just need to update all code to the new API and API files.??? doubt it'll be that simple.
problem is i think this new Oauth2 needs to be enabled via the developers admin console to use the new API.

so i guess its reworking it to work with a new account too

if only i had the skill.

gContactSync doesn't seem better than this if im honest.