Hi @stevland,
sorry, I thought this problem related to firefox browser tracking protection.
checking with Ctrl+Shift+I, shown that
The resource at “https://developers.google.com/+/images/branding/sign-in-buttons/White-signin_Long_base_44dp.png” was blocked because content blocking is enabled.[Learn More]
after enable for cookies here, now loading correctly, thanks for the information (thought before there is a problem with css), now is solved. <br /><br />
thanks
btw, after checking, class.auth.php this coming from oauth plugin, so url coming for google