Use tamperdata to view and modify HTTP/HTTPS headers and post parameters. Trace and time http response/requests. Security test web applications by modifying POST parameters. FYI current version of Google Web Accelerator is incompatible with the tampering function of TamperData. Your browser will crash. A few people have asked about donations. If you are so inclined, consider donating to the Toront
![Tamper Data – Get this Extension for 🦊 Firefox (en-US)](https://cdn-ak-scissors.b.st-hatena.com/image/square/e3c9082b683c11f6523f5142352300916c540527/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F1%2F1511.png%3Fmodified%3D1530207885)