Firefox 19 introduced an integrated PDF viewer. Unfortunately, it can't handle all of the formats and features supported by the Adobe plugin (yet). If you cannot read PDF's on this website you will have to switch your PDF viewer from the one built into Firefox to the one installed in your PC (usually Acrobat Reader). Check out this article: How to disable the built-in PDF viewer and use another viewer.
If you thought fractional banking was bad wait until you see Fractional Voting!