well :) thanks for opening my eyes :)  i was damned sure that i used the same filename (except the file-extension) - i was wrong :)

hochzeit-mp3.ogg
vs.
hochzeit_mp3.ogg

I'll test that when i'm home from the office

http://www.lichtwerk.at/alexandra-ewald … /hochzeit/

with juiceboxbuilder-pro i set the ogg & the mp3 file - but that doesn't work, only safari plays the sound, Firefox doesn't care about den ogg file which resides in the root of the above listet URL