Product Pages/Info Loads Slow with Firefox, any ideas?

Hey guys,

My website, https://www.ecsmotorsports.com
Example page: http://ecsmotorsports.com/3-series-06-11/exhaust/exhaust-systems/borla-true-dual-2-5in-ss-aggressive-exhaust-system-br-for-b-335i-e90-e92-b

In IE, Chrome, and Safari, the page loads very fast and just right.

With Firefox/Nightly it loads SLOW.. too slow for customers. I've confirmed this on two computers on two different networks.

Any ideas?

Modules:
Simple SEO URL
Zen Lightbox
Easy PAges
Easy Populate

Thanks in advance guys..

And yes, I did search lol

If you are truly using ZenCart v138a - you need to upgrade before you are hacked and have to clean as well as upgrade.

Try turning on page parse times

admin > config > Logging > Display The Page Parse Time > true

My copy of Firefox wants me to install Apple Quicktime when I access your page. I'm not sure why, but that might be the source of the problem.