If you have Really Simple SSL Pro installed, you might get the warning that your site contains references to JS or CSS files on other domains which in turn contain non-secure links.
To fix this, you can try to ask the file owner on that other domain to change the URLs from http:// to //, which would make the script protocol independent.
If that is not possible, you can:
- Download the file
- Look up the http:// link and change it into //
- Upload the file to your own site
- Lookup the file or post where the file was included
- Change the URL of the link, so that it points to the new file.
If this file is included in a plugin or theme, contact the plugin/theme author to request this update. Most would be happy to make this improvement.