If you trust the content you are trying to display, you would need to allow the content to load, otherwise you would get a blank area where you expect content to appear. Please see the information below for more information using Internet Explorer, Google Chrome, and Mozilla Firefox.
- MS Internet Explorer mixed-content warning - http://msdn.microsoft.com/en-us/library/ee264315(v=vs.85).aspx
- Google Chrome insecure content warning - http://support.google.com/chrome/bin/answer.py?hl=en&answer=1342714
- Firefox 23 or later now enables mixed content blocking by default –https://developer.mozilla.org/en-US/docs/Security/MixedContent