Opera Mini can't render HTML (only OPML), so they have to make the SSL connection on your behalf from the server. This isn't exactly a MITM attack, and from wha

Opera Mini can't render HTML (only OPML), so they have to make the SSL connection on your behalf from the server. This isn't exactly a MITM attack, and from what I remember last time I played with it, they even warn you of the implications the first time you try to view secure content. Opera Mobile and Desktop never mess with SSL, period.