How can I see what data I'm sending when I click the GO button on a website?

Is there any way to see what gets submitted with I click Submit or Go on a website? like a 3rd party app or debugging application?

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ncooConnect With a Mentor Commented:
You could use one of the IE addons for firefox as well:

Or set the user agent to an IE one:

You will then still be able to use live headers.
I'm sure everyone is already using FF on here.

Use this add on:

You can see all sent/requested data.
GiracAuthor Commented:
Here is the kicker, the site doesn't run under FireFox, only under IE. and I would like to see what is being passed back to them.
Any way to check with a 3rd party app  for IE?

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