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Opera resident spec wizard Anne van Kesteren announced that due to the discovered security issues with WebSocket protocol handshake, Opera will ship Opera 11 with WebSockets disabled. Fear not though this potential security issue does not affect Flash or Java in Opera as Opera's implementation prevents abuse here.

Not sure what WebSockets are? It's a protocol that allows communication between browsers and servers. For more information check out the pretty sweet http://www.websockets.org/!

Update: We are looking into potential issues with Flash and Java as well.