Hey,
Did a test on your site, it loads in over 12 seconds, so that is a point to consider as well. Thing is, Firefox handles webfonts differently and we also get that on our demo site, although for a shorter time, as we run the demo on a dedicated server.
Generally, number of plugins that add JS to the site, number of fonts pulled in – these are all factors that decrease page loading times. I also see you’ve minified the HTML – not sure that would really help unless you get thousands of visitors. Also, just a FYI – minification and compression plugins won’t really work with complex themes such as Flexform, so in case you’re starting to experience broken JS issues, keep this in mind.
Regards,
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Cosmin – Support