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There's so many different things that could cause what you describe that it's impossible to diagnose with the information provided. I tried to go to the site you last ran Autotune from, but it's offline.

Can you set it online or send us Super Admin credentials and we'll gladly try to take a further look.

My only suggestions are:
* Ensure the Include jQuery / Bootstrap setting is enabled
* Try with the standard Joomla template
* Check the browser console log for any error messages that may be reported when you try to authenticate.

Thanks,
Alex

The only option I can suggest is to set the "Show 'Login Credentials' in popup" option to 'No'. That will redirect the user to Facebook to authenticate and then back to your site after they do.

The popup requires Javascript from Facebook to operate which Firefox will block if the tracking protection option is enabled. Unfortunately, there's no work-arounds for that as Firefox is blocking things as the user has requested with that setting.

I hope that helps,
Alex