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Came from https://groups.google.com/forum/#!topic/httpfiddler/ZTyPVUANqN4.
I find that I can't find WebSocketMessage in FiddlerScript Tab side panel, bug I do find it in CustomScript Window.
Please refer to attachments.
Add fiddler version screenshot.
Simple tweak to the RulesTab2 code to add the WebSocketMessage class.
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