Here is an example of what I am seeing: http://readingsbykaren.com/new/index.html I have made sure that the webm codec is added to my .htaccess file with: AddType video/webm .webm And in the examples posted on Mozilla's website, they are saying that the webm file must come FIRST, which will cause all other browsers (except Google's Chrome) to refuse to load the video file! My code is available on the website link. I will NOT rearrange the order in which the video streams are parsed by the browser. Mozilla needs to understand that causing all other browsers to fail just because they do not want to purchase a codec is an inappropriate request to webmasters everywhere. I am enclosing a photo of the result of this code in Firefox and please note, all other tested HTML5-compliant browsers simply load and play this video and all other video on this website!