I found that firefox has a strict policy for local files. As soon as I am on Linux, I'll check it out.
http://stackoverflow.com/questions/2...-chrome-and-ie

I found something about the json errors too: http://forum.jquery.com/topic/firefo...ot-well-formed

I'll try to build chromium 17, maybe it becomes faster and less resource-hungry than chromium 5.

Anyway, running this in MicroB would be the best.