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by oib 4241 days ago
The second one is possible with the Tamper Data plugin: https://addons.mozilla.org/nl/firefox/addon/tamper-data/
1 comments

It would be very handy to be able to modify the payload of requests/responses as well without resorting to MITM proxy applications.
Tamper Data is not a MITM proxy. It's a browser add on that modifies the request before the browser executes it.