SWFObject Question:

Do you have the Adblock extension installed? In Firefox 3 Adblock incorrectly blocks Flash content (the object tag only, so that's why content embedded with SWFObject 1.5 does work, because it uses the embed tag), even if your entire page is whitelisted. In this case just disable Flash block (by disabling the extension, don't use Adblock's disable feature, because then it still won't show Flash content). Please note that the development of and support for Adblock has been discontinued.