“Resource interpreted as Image but transferred with MIME type text/plain.” error

The Safari's Web Inspector reports the following error, when I am visiting a page here on meta.

The string that appears before the error message is the following one:

The following is the information WebInspector reports about the open WebSockets.

I am not able to see the message about new activity other users see. Could this error be the cause?

I am using Safari 5.1.3 on Mac OS X 10.7.3.

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WOW, that was super random. I instinctively flagged this as off-topic, lol. –  Purag Mar 3 '12 at 22:10
Nah, this is just contentless request that QuantServe uses to get all up n ur interwebz. The response doesn't include a content type, so since it falls back to text/plain and Safari was expecting an image, it gets upset. –  Tim Stone Mar 3 '12 at 22:14
Whoops, got my WebKit browsers confused. ;) –  Tim Stone Mar 3 '12 at 22:18