XHR request callback is not called in FF3

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I encountered a problem while making an application to run on FF3.
The application uses ajax extensively and has callbacks for synchronous and asynchronous calls as well.Every thing works fine in IE variants and FF2.

Coming to FF3, the callback is never invoked for synchronous calls and the user has to make the call explictly.

The problem and the solution is clearly explained at

https://bugzilla.mozilla.org/show_bug.cgi?id=313646
http://developer.mozilla.org/en/XMLHttpRequest

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