Problem with Firefox? Learning Interaction works with IE and Chrome.

Captive version 9. Windows 7. Latest version of all browsers.  Export as swf.

I have previously successfully used the YouTube Learning Interaction using Firefox. I recently tried this for a couple of trainings, and it failed in FF. However, it worked just fine with IE and Chrome. Tried this on a couple of FF browsers. Am I missing something, or did Mozilla do something that has affected this learning interaction. I just see the background, no trace of the YouTube video. Again, this works for the other browsers. Thank you for your input. Mark