Feedback from jorge@kune.cc, confirmed by Samer:
In Firefox 19 (Ubuntu 12.10) gadgets stopped working. Some appear in blank, others appear partially (a field or an icon) but not the rest of them and they don't work at all. With FF 18 they were working. With websockets disabled in FF 19 gadgets still don't work. Firebug aborts some requests to opensocial.googleusercontent.com (example in a comment). Tried in http://kune.cc/?locale=en#!samer.docs.71.4139 where many gadgets are inserted at once.