Firefox has no JNLP association how do I make one?

I have downloaded a JNLP file from
http://phet.colorado.edu/en/simulations/category/physics
for a physics class that I'm taking, but the file will not load or start in Firefox.
Java Web Start has already been installed by the system administrator but there is no file association for, nor is there a "JNLP" file type listed in Firefox --> Tools --> Options --> Applications
How can this be fixed so that the "JNLP" file type is listed in Firefox --> Tools --> Options --> Applications?
If you can get me that far I can do the rest by making the file association to javaws.exe.
Thanks.

Sorry I should have mentioned that I'm using Linux. Specifically: Kubuntu 12.04
Since this was a java problem, I thought it could be fixed within firefox.
jscher2000: When I try your suggestion I get no option to browse for a file to open it with, and the only option is IceTea Java Webstart. When I click on that I get the error message: /tmp/faraday_en.jnlp could not be opened, because an unknown error occurred. ...and this same error occurs no matter what jnlp file firefox is trying to open.
Cor-el: As I stated in this post I'm using Linux so there is no registry to edit, and as such your solution doesn't apply to my setup. There should be a configuration file someplace on Linux to do something similar but I'm not sure how or where to even begin looking or even what to search for in google to figure that out. So I'm basically stuck.
Thanks for the input. Any other Linux based solutions would be greatly appreciated.

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