Opera 12 should be safe, as it doesn't support the heartbeat extension I tested it using openssl's s_server (with a quickly generated cert using tinyca) and th

Opera 12 should be safe, as it doesn't support the heartbeat extension I tested it using openssl's s_server (with a quickly generated cert using tinyca) and then connecting to https://localhost:12345 https://localhost:12345 openssl s_server -accept 12345 -tlsextdebug -cert cert.pem | grep ^TLS TLS client extension "server name" (id=0), len=14 TLS client extension "renegotiation info" (id=65281), len=1 TLS client extension "status request" (id=5), len=5 TLS client extension "next protocol" (id=13172), len=0