But it is on Firefox both desktop and devices.
Nothing tricky here. Just added a sound file, set to autoplay and loop. Open in Safari or Chrome on a mac and no autoplay. Open in Firefox on mac, PC or android devices and it plays just fine (Surprising for the android devices but maybe on the latest update they abandoned the stupidity of not autoplaying if on wifi, haven't tried on 4ge). The fact that it works on Firefox and not the others (current versions all) seems to indicate it isn't the setup. Are there any known gotchas? Ideas?