After reinstalling Windows 8.1 64bit Pro Firefox will not show a video in HTML5, only in Flash Player.

This worked before i reinstalled my operating system. I am on the same website it worked on and now the videos will only play in Flash Player...
I have asked the website developer if he has changed something with the player, but nothing has been changed.
I have also reset my firefox, but nothing worked.
My firefox version is 34.0.5, and i have provided screenshots below. Can some of the plugins i use have something to do with this?
Please reply if you need more information about this.
Thanks.
- Jonas Schirmer

* 1
Make sure that all the plugins you want / need are installed and up to date.
* 2
Type '''about:addons'''<enter> in the address bar to open the '''Add-ons Manager.'''
Hot key; '''<Control>''(Mac:<Command>)'' <Shift> A)'''
On the left side of the page, select '''Plugins.'''
Make sure the ones you want to use are set to '''Ask''' or '''Allow.'''
* 3
Go to the web page. Once the page is loading, mouse to the address bar
and '''Left''' click the icon. A window for displaying site information should
come up. Select '''More Information.''' Now select '''Permissions.''' In the
menu, Make sure the ones you want to use are set to '''Ask''' or '''Allow.'''

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