New version of Firefox no longer playes videos on my website

Have no problem playing them on IE, Safari and Chrome.
Used to play on prior versions of Firefox.
Link to site is http://www.somaxsports.com/video.php
Hope someone can help. Lots of people use Firefox to view our site.

When I load a page (in this case, the 150-mph serve page, I get 3 errors in Firefox's Error Console. (Also, the video does not play.)
You can view those errors as follows:
* Open the console using Ctrl+Shift+j
* Click the Clear button
* Leaving the console open, reload the page bypassing the cache, using Ctrl+Shift+r
* In the console, click the Errors button to filter the list (the other items are style sheet warnings)
This is what I see:
(1) Error: The stylesheet http://somaxsports.com/index.php was not loaded because its MIME type, "text/html", is not "text/css".
This is generated by /css/header.css which is retrieving an HTML page, which then redirects to the site's home page. Neither is a stylesheet.
(2) Error: The stylesheet http://somaxsports.com/index.php was not loaded because its MIME type, "text/html", is not "text/css".
This is generated by /css/content.css which is retrieving an HTML page, which then redirects to the site's home page. Neither is a stylesheet.
(3) Error: ReferenceError: selected is not defined
Not sure what's causing this, but it may be the onload handler in your <body> tag.

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