[brett]

Hi, I work at Posthaven and we host his blog.

Odd, video on the site works for me on Firefox (25.0.1 on OS X), and we're actually using mediaelement.js which is listed on the page you link to. What OS/version of Firefox are you using?

[jdlshore]

Sorry, didn't see your reply. Feel free to contact me directly at the email address listed in my profile.

I checked into this further and it looks like a bad interaction with the FlashBlock plugin on Firefox. When I whitelisted the site, it worked fine.