Using FF 3.0.10 on Windows https://www.meebo.com/ is an EV site that has mixed content, including two images loaded from http: URLs, but does not show any of the usual mixed content warnings. The lock icon looks normal, and the address bar shows the words "Meebo, Inc. (US)" on a green-ish background. In other words, it's the full EV UI, despite the presence of http content on screen. If you're wondering, right in the middle of the page is an image of a white letter "F" against a cyan background. That's loaded from http://static.ak.fbcdn.net/images/fbconnect/login-buttons/connect_white_small_short.gif The page also contains a background image loaded from http://share.meebo.com/imthis/img/button-blue.png

Pretty sure this is a dup of bug 135007. This is fixed on trunk as well as 1.9.1 (aka Firefox 3.5) but the fix was not backported to 3.0.x. It's a painfully old bug, it was nice to see it fixed.