A significant disadvantage for the Flash developer of the new version of Firefox 3.6.6 is that it cuts off the Flash Player during debug. It is necessary to set a breakpoint and wait a couple of seconds - so he immediately kills the process of the Flash application and displays the window:
Wean him so you can do by going to about:config and cut off this functionality by setting the following flag: dom.ipc.plugins.enabled.npswf32.dll = false