Mixed ( insecure) Content
Notice about insecure content varies from browser to browser.
Example of a Firefox notice:
Connection Is Not Secure. Parts of this page are not secure (such as images)
Received as: notification in browser.
Happens after: SSL installation
Caused by: non secure (http) content being loaded on a secure (https) page.
Solution:
-
refresh the page with enabled Firebug Console:
detect “Loading mixed (insecure) display content” console messages:

select and copy URLs of insecure content one by one
open copied URLs in separate browser tabs to view the content
re-upload insecure content.
Re-uploading insecure content
Theme related images are: logo, background image and header image.
If you see theme related image after you open copied URL in browser tab:
Troubleshooting requires active support service.