Can't watch age-gated videos on firefox 19.0.2

So I can't play this trailer, browser is Firefox 19.0.2, Windows 7. The player setting don't matter, because (and I only found this out by going through Chrome), age-gated videos don't show their age gate on firefox.

So because the age-gate isn't shown, the video player does nothing.

Hey duder,

I just went on Firefox 19.0.2 on Win7 and put in 1/1/1990 for my age and the video played. Would you happen to be using AdBlock or any other page-modifying Firefox extensions? If so, try disabling it