The player has the following rules:
0) Disable the forceMobileHTML5 url flag
1) If using chrome 14 or above lead with html5
2) If using firefox 3.6 Force flash and do not fallback to html5.
3) If using an iPhone show an html message: Your device is not supported
4) If using firefox above version 4 lead with html5
If no rule is matched, standard lead with flash rules apply

Force Mobile HTML5 Notice that this url param has no effect since user agent rule "disableForceMobileHTML5" takes precedence.