I am using the plug in on my woocommerce site. The checkout page for my shop is being served up fine with the SSL in Chrome and Safari but my customers accessing the shop through Firefox and IE get an alert stating the checkout page is not secure.
The full alert in Firefox states:
This website does not supply identity information
The connection to this website is not fully secure because it contains unencrypted elements (such as images).
On my checkout page I have selected "Secure posts" and "Secure child posts". In WooCommerce I've selected that my checkout page be served via SSL.
Why would SSL work in Chrome and Safari on my checkout page but not in Firefox or IE? How can I change this?