According with the MDC the debugger statement was introduced in ECMA-262, Edition 5
Invokes any available debugging functionality. If no debugging functionality is available, this statement has no effect.
I’ve tested this statement in Internet Explorer 8, Firefox 4b10 and Chrome 9. And works when you have a debugger running. Note: In Firefox you need Firebug available for that page.
Here you have some screenshots:
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