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But the current version of Flash Firebug, 3.0.3, has a bug that causes it to display this error:
No SWF files with AS3 detected on this page. You could try reloading the page.
This can happen even when there definitely IS an Actionscript 3 swf on the current page. To resolve the problem, install any later version than 3.0.2, available from this site: