I built a wordpress site with video and none of my video formats (including webm) will play in Firefox. Can you help troubleshoot?

Question

The site is using a custom Wordpress theme. There are options to add different types of video for different browsers, and I've added webm for Firefox and MP4 for other browsers. The MP4 videos play great on all other browsers, but the webm doesn't seem to be working on Firefox. I get a blank screen on Firefox when I have only MP4 and also when I add the webm video. I'm pretty sure the MP4s were working in Firefox 19, but not on FF 20.
I added the troubleshooting info below. I have disabled my plugins and add ons as part of the troubleshooting process, but I don't think they're the problem. Please let me know if you have any leads!
Thanks,
Jeff

Answer 1

I am not sure, how much this code snippet will help - in any case you need to embed the file (ogv in the case below) into a wrapper as follows
<script type="text/javascript" src="http://s3.amazonaws.com/s3.www.universalsubtitles.org/embed.js">
"base_state": {
"language": "sl"
"video_url": "http://videos.mozilla.org/serv/brand/Mozilla_Firefox_Manifesto_v0.1.ogv",
"video_config": {
"width": 550,
"height": 310
</script>
The code is from mozilla.si (worpress-based) page.
Hope it helps.
Regards