Browser problem

Facebook login is not working because following Facebook Like button script contains a different Facebook App ID than the one you are using for Facebook Social Login at our plugin options page:

<!--Facebook Like Button Script------>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=136911316406581";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

Replace 136911316406581 in above code with the Facebook App Id you are using for Facebook login.
For Facebook Login to work in Firefox, you need to disable “Tracking Protection”.

Google+ login is not working because you have not enabled Google+ API in the Google App you have created. You need to follow step 4,5 at http://support.heateor.com/how-to-get-google-plus-client-id/

if I change my pc, I also have redirection problems.

Let us know what redirection problems are you facing if you want us to help.

The second problem is the sharing of articles. If I use Chrome, instead of opening a simple pop up (which until Friday did and now no more) opens a new window … But of course, if I use Firefox I open the pop up as usual.

Make sure you are using latest versions of your browsers.

Yes, we noticed latest version of Google Chrome is opening new tab when used share icons. We are looking into it.