How to silent default juggernaut alert in firefox?

I'm using the Juggernaut plugin in a rails application.

http://github.com/maccman/juggernaut_plugin

I can't find how to disable the alert() when ru开发者_如何学编程nning my app in Firefox.

Any Ideas ?

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Ok, what a shame... :-/

The helper must be like this: <%= juggernaut :debug => false %>