Preventing automatic sign-in when using Google+ Sign-In
Update The best supported way to prevent automatic sign-in is to use the API method gapi.auth2.getAuthInstance().signOut() which will prevent automatic sign-in on your site after it has been called. Demo here. In the demo, the user is signed out when they leave the page as shown in the following code: window.onbeforeunload = function(e){ gapi.auth2.getAuthInstance().signOut(); }; … Read more