Firefox plugin for form submission analysis?

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I often write perl scripts that go to websites and retrieve
information. Often they use forms.

Sometimes it is difficult to figure out just what form information is
submitted, especially if the site uses javascript and not plain HTML
to describe forms etc.

I would like to know if there is a plugin for Firefox (or some other
browser) that could log or display entire form contents before
submitting them. With output such as:

Form submitted to:
Field from=10/12/2005
Field until=10/17/2005
Field datatype=purchases

or some such output. Thanks.


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