I am getting the following error under Firebug:
Can I just ignore this?, there is no such file in the theme downloads and I do not recognise this from anything else I have worked on?.
I have the latest WP 3.6 and updated the theme to the latest release. Not a problem, I just wondered if this was something important?.
The theme doesn’t include such a file. I’d suggest to deactivate all plugins and to activate them one by one to find the plugin which adds this code to the html output.
A fresh installation with WordPress 3.6, Enfold 2.0.1, disable all plugins.
Please see this screenshot of Google Chrome: http://i.imgur.com/tuFNxrx.jpg
I think the problem is with WordPress.
I downloaded and installed WordPress, no plugins and theme Twenty Thirteen active.
I found this reference to a possible solution, waiting to WordPress 3.6.1: http://core.trac.wordpress.org/ticket/24994
Like Dude said, please try deactivate all plugins or better yet remove all of them on wp-content/plugins folder.
Maybe you did not read? Is a little bug in WordPress, which occurs only with Google Chrome