WebM Video won't play in Firefox 4

I cannot get this video to play in 开发者_如何学运维Firefox 4.

http://m1.animedlc.com/webm_test/

It plays fine in Chrome. I haven't tried anything else besides FF4 and Chrome. I converted it from a avi file. Any idea? Thanks.

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A little more research told me to add AddType video/webm .webm to my .htaccess and that worked fine.