When FF should show a Flash Player element *.swf from a site with IDN URL something goes wrong and halts. (Things go ok in IE and Opera). The problem is related to the IDN URL or FF translation of the URL. An IDN URL in local text may look like this "[http://www.stålberg.se/test/index.html]" (You may not see this correct if this post is not in UNI code and I do not know if it is, sorry) this is translated into "http://www.xn--stlberg-fxa.se/test/index.html" I can see in the settings for Flash Player, "local storage" that IE is showing the right translated URL, but in FF Flash Player settings for "local storage" shows something at translation with % notation.