Firefox not rendering webfont in 25.0.1 on some pc

Question

I am using a webfont hosted on my website's server and it shows up perfectly in all other browsers, and in most versions of Firefox 25.0.1 on Mac and PC, except some versions of PC's are not rendering it.
I have had one of the problematic users check their "Allow pages to choose their own fonts..." and it DID NOT fix the problem.
I have added the webfont into a header design built in HYPE. Here is the webfont coding I'm using, and again, it works fine on most PC's, but at least two users are having problems:
URL to test:
*http://www.artacademy.edu/index.php
Coding used:
<pre><nowiki> <meta name="viewport" content="user-scalable=yes, width=960" />
<style>@font-face{
font-family: 'bebasneue-webfont';
src: url('http://www.artacademy.edu/css/webfont-header/bebasneue-webfont.eot');
src: url('http://www.artacademy.edu/css/webfont-header/bebasneue-webfont.eot?#iefix') format('embedded-opentype'),
url('http://www.artacademy.edu/css/webfont-header/bebasneue-webfont.woff') format('woff'),
url('http://www.artacademy.edu/css/webfont-header/bebasneue-webfont.ttf') format('truetype'),
url('http://www.artacademy.edu/css/webfont-header/bebasneue-webfont.svg#webfont') format('svg');
}</style></nowiki></pre>

Answer 1

Did you also make them check the gfx.downloadable_fonts.enabled pref on the <b>about:config</b> page to make sure that downloadable fonts are enabled.
*http://kb.mozillazine.org/about:config
You can also use the Web Console (Firefox/Tools > Web Developer;Ctrl+Shift+K) to check for errors and use the Fonts tab in the Inspector to check which fonts are used.