wmode should work on FF also, try this:
PHP Code:
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="100" height="100">
<param name="wmode" value="opaque" />
<param name="movie" value="flash.swf" />
<param name="quality" value="high" />
<embed src="flash.swf" quality="high" wmode="opaque" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="100" height="100"></embed>
Also make sure u got latest version of FF!
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