Debugging data sent by webbrowser

Is the开发者_StackOverflow中文版re a simple way how can I see what data exactly is webbrowser sending to server including header and post data? Preferably some kind of extension/plugin for chromium or firefox?

Cheers, Tom

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Chrome already brings Developer Tools. You can access them via Cmd+Alt+I or Wrench -> Tools -> Developer Tools. A similar tool is available on Firefox as the excellent "Firebug" extension. This one is actually the mother of all those extensions and is the inspiration of all of the currently shipped ones.

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Firebug (Firefox) Developer tools, or Firebug Lite (Chrome)

You can analyse the data using the Network profiler.

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I guess you already tried firebug or chrome developer tools, and didn't find enough details/control, so try this one, for firefox : http://livehttpheaders.mozdev.org/