Ran into this little issue recently where SSL Cert showing up perfectly on all browsers, however after a few seconds in Firefox the lock would turn to a warning.
This suggested that there were unsecured assets. But, when viewing the assets list in the Firefox media tab, none of these assets were unsecured.
If you run into the same issue, check your net tab in Firebug, you may have a single 302 Redirect on an asset.
What happens here is after a failed request for the asset at the https:// location, Firefox tries to attain the same asset from the similar http:// location.
This is likely the cause of the “Connection partially encrypted”
