Tamper Data is an add-on for Firefox that lets you view and modify HTTP requests before they are sent. It shows what information the web browser is sending on your behalf, such as cookies and hidden form fields. Use of this plugin can reveal web applications that trust the client not to misbehave.
For downloads and more information,
visit the Tamper Data homepage.
Good firefox extension for manual web application test.
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Good firefox extension for manual web application test.