Dec 9, Debug Flash/SWF/Flex files on the web. Only with Firefox—Get Firefox Now ( wa3pukjflw.cf). But if the default browser is firefox, you'll only be able to browse the folder :// wa3pukjflw.cf#. Using the ExternalInterface class, you can call an ActionScript function in the Flash runtime, using See wa3pukjflw.cf html.
Update or Install Flash Player in Firefox
Flex 3: Firefox Beta 3 returns 0 for HTTP status codes | John C. Bland II