or request body modification ? What is your experience level with proxy-based tools?

This functionality is invaluable for debugging, testing, and security research, but it also comes with significant responsibilities and risks.

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Tamper Dev is the closest direct replacement for the classic Tamper Data. It revives the core concept but with a more modern and robust implementation.

Testing for vulnerabilities like SQL Injection, Cross-Site Scripting (XSS), and Broken Object Level Authorization (BOLA) by altering parameters.

While there is no official "Tamper Data" extension developed by the original Firefox creators for Google Chrome, several high-quality alternatives allow you to intercept and modify HTTP/HTTPS headers and POST data in real-time. Top Chrome Alternatives to Tamper Data Tamper Dev

Chrome allows you to mock server responses locally without changing the backend: Open DevTools and go to the tab. Select the Overrides sub-tab. Click Setup Overrides and select a local folder.

Because of this, security professionals have moved to alternative tools.

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