 <p>Wireshark won't help you if you have to debug HTTPS requests (unless you can get the encryption keys for both endpoints - see the Wireshark site for details). Firebug and Tamper Data are getting close, but for thorough analysis, I sometimes like to save a recorded session. I'd recommend giving <a href="https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project" rel="nofollow noreferrer">the OWASP Zed Attack Proxy</a> (the successor of <a href="http://www.parosproxy.org/" rel="nofollow noreferrer">Parosproxy</a>, which is no longer actively developed) a try. It is a Java application serving as a http(s) proxy; it provides quite a lot of features and proved to be very helpful to me in the past.</p> <p>ZAP offers an easy autoconfiguration of Firefox. Bear in mind to do that on a separate (meaning: not for other browsing activities) Firefox profile: In order to intercept https, ZAP will install a new SSL certificate.</p>