Audio file doesn't show up when viewing page in Firefox

[Derek Williams]

mp3 file doesn't show up when viewing page in Firefox, despite appearing and playing in the editor, and appearing in Safari.

​https://sites.eca.ed.ac.uk/mmus-orchestration/wp-admin/post.php?post=107&action=edit

​https://sites.eca.ed.ac.uk/mmus-orchestration/wp-admin/post.php?post=55&action=edit#

[Derek Williams]

mp3 file as it appears in the Media browser

[Derek Williams]

File inserted into the Page thread

[Derek Williams]

Page updated

[Derek Williams]

No sign of playback transport graphic when the page is viewed in Firefox

[Derek Williams]

However the file DOES display and play in Safari

[Derek Williams]

This is the offending.mp3 file whose playback transport displays in Safari but not in Firefox

[Derek Williams]

Safari version 6.1.6 and Firefox 32.0.3

[wonderboymusic]

One of your plugins is loading jQuery without enqueueing the WP version = BAD.
It is loading it as HTTP when your site is loading over HTTPS:
​http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js?ver=3.9.2

Disable your plugins and try again. If it is still breaking, it might be your theme. This is not a WordPress core issue, per se.

Also, you are running WP 3.9.2, not 4.0.

<meta name="generator" content="WordPress 3.9.2" /> in your page source.

[wonderboymusic]

No feedback - this is undoubtedly caused by a plugin.