Its working for me fine, perhaps you could clear your cookies and update FF and your media players. I've occasionally had similar vids wont work in FF but do in IE, I don't know if its a developer problem its usually rectified in a few days.
I've reinstalled the Firefox, the Adobe stuff and still can't get it to work. The only plug in or add on I've got switched on is the Shockwave player.
The BBC have this on their help site which they've changed slightly from yesterday -
Javascript Error – Why am I unable to play content through BBC iPlayer?
We are aware that some users are currently experiencing problems with Javascript.
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