Firefox HTML5 H.264 problem

[Snowflake]

Hello,

I have problem with HTML H.264 on YouTube player. Is there any way to enable H.264 in zennoposter?
I tested it on every firefox version in zennoposter.

 

[VladZen]

https://zennolab.com/discussion/search/10083691/?q=HTML5&o=date&c[node]=140