nsIFormSubmitObserver::Notify does not Notify on all submit form site?

[email protected] (yueweng)
Newsgroups gmane.comp.mozilla.devel.xpinstall
Organization http://groups.google.com
Message-ID <bdd3dfe3.0407192006.60d4e477__38735.6778177947$1090301533$gmane$org@posting.google.com> 
Dear all,

I have implement nsIFormSubmitObserver, but I realise
nsIFormSubmitObserver::Notify() does not get called back on certain
website that uses submit. For example, http://mail.yahoo.com does not
work.  However, it works on http://www.hotmail.com submit button. 
Does anyone knows why?

yueweng
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