Flash problems with Firefox?

Posting this here because it seems the most appropriate forum:

I’m pulling my hair out trying to determine why Firefox won’t load a flash site I created for a client. The html was generated using SWFObject, and when the site went live it loaded fine in XP/IE/Firefox and OSX/Firefox/Safari/Chrome. Now, a couple months later, it refuses to load in Firefox (loads fine in the others). I’ll get a “Transferring data from [sitename]” message, then “Read [sitename]” and finally, “Done.” But the page remains blank. Right-clicking doesn’t even show that a Flash player is on the page. I’ve checked the HTML, and while the client added a meta tag for google site verification, it all looks right.

So, are there any new Firefox/Flash issues? I’ve searched and haven’t found anything, and I don’t have problems with any other Flash sites. I have no idea where to start looking.

Add: I’m not using any adblockers, and haven’t installed any new FF plugins since the site first went live.

The site is http://formationdesign.com