Can't huffduff a particular speechification mp3

went to http://speechification.com/2008/10/15... and used the huffduff it bookmarket only to be told "must be an audio file", which the mp3s clearly are because they both play and download. I've tried pasting the URL as well but it doesn't work.

I guess this is either because the URL starts with "https" or because it ends with "..mp3"
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