That's from Opera. See http://help.opera.com/opera/Windows/1781/en/private.html http://help.opera.com/opera/Windows/1781/en/private.html "If you are browsing o

That's from Opera. See http://help.opera.com/opera/Windows/1781/en/private.html http://help.opera.com/opera/Windows/1781/en/private.html "If you are browsing on an encrypted connection (https:// https://), Opera checks to ensure that all parts of the site are encrypted. If Opera detects that any live elements of the page, for example scripts, plugins, or frames, are being served by an open connection (http:// http://), it will block the insecure content. This means parts of the page may not display properly. Opera advises against allowing insecure content to load into an encrypted connection. The best way to protect your sensitive information is to interact only with secure content. When Opera detects insecure content and blocks it, a warning will appear in the right side of the combined address and search bar. If you do not care about the security of your connection with the site, you can click the warning to show an Unblock button. This button will allow the blocked content to be loaded onto the page, and the security badge will change to show an open padlock, reminding you that you've allowed insecure content to display on an encrypted connection."