Firefox won't play .webm and .ogv videos with HTML5

Question

I prepared 3 video formats for my site:

/assets/video/background-purple.ogg
/assets/video/background-purple.webm
/assets/video/background-purple.mp4

Answer 1

Seems I've found a solution:

I switched my ogv codec from VP8 to Theora and now Firefox can play video correctly.

I used this code for the source:

The MIMEtype is:

AddType video/ogg .ogv .ogg

And the codec is:

Xiph.org's Theora Video (theo)

I guess it could work also for .webm but I've not tested it.