Tamper Dev Firefox ((better)) [ Extended ✦ ]

Historically, this functionality was popularized by a tool called "Tamper Data," a legacy Firefox add-on that became a staple in the pen-testing community. However, with the transition of Firefox to the WebExtensions API (Quantum), the old legacy extensions ceased to function. is the spiritual successor—a modern, secure, and actively maintained extension built for the new Firefox architecture.

For ethical hackers and bug bounty hunters, Tamper Dev is a reconnaissance weapon. It is perfect for testing: tamper dev firefox

In the popup, modify the headers (like User-Agent or Cookies) or change the POST data. Click "Submit" to send the modified request to the server. Ideal Use Cases Historically, this functionality was popularized by a tool