We have tested the following browsers on using Lun: Firefox 3.0.x, Chrome, IE 6 and 8 Beta and Opera 9.62. For cross-domain scripting, we use the ScriptTransport by Thierry Schellenbach and John-David Dalton. All browsers except IE 8 Beta have some kind of timing issues with Ajax.Request. We settled down on using callback in JSON instead of using onComplete event handler.