Hello René Balke,
Sorry for late reply to this,
Yes, as Mark mentioned before the StumbleUpon script is already rendered using https from our code, so I have try to manually generate the script from
http://www.stumbleupon.com/dt/badges/create (
http://screencast.com/t/aLSQAN5uH ) and see what is the happening if i put the script in your
JoomlaFolder/components/com_easyblog/themes/elegantblue/blog.read.php (
http://screencast.com/t/c4tvARrkZA )
<!-- Place this tag where you want the su badge to render -->
<su:badge layout="5" location="https://www.vertragstresor.de/blog/archiv-unseres-blogs/entry/2014/03/24/einen-handyvertrag-sinnvoll-verlaengern"></su:badge>
<!-- Place this snippet wherever appropriate -->
<script type="text/javascript">
(function() {
var li = document.createElement('script'); li.type = 'text/javascript'; li.async = true;
li.src = ('https:' == document.location.protocol ? 'https:' : 'http:') + '//platform.stumbleupon.com/1/widgets.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(li, s);
})();
</script>
You can see the result here :
http://screencast.com/t/tbshUx4vkt
You should consult this to stumbleupon developer and see how it goes.