How to get HTML5 working for firefox videos?

So, recently, I built a PC. I installed firefox and can't seem to get HTML 5 video work. I activated webm in the config to get at least the HD on youtube but without that I would be stuck in that loading only in 360 p. When I go to the youtube HTML5 test page it has no notches for H.264 and MSE & H.264. Not sure what the problem is. Firefox not HTML 5 fine on my old laptop. I moved my my old firefox profile to my new firefox so that I would keep all my preferences and so on. Also, I'm on Widnows 8.1 N if that all makes a difference.

I think with the edition of 'n', you will need to download the Feature Pack Media:

https://support.Microsoft.com/kb/2929699
http://www.Microsoft.com/download/details.aspx?ID=42503

Tags: Firefox

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