How to export master secret from browser SSL/TLS session?

Question

I\'d like to open a browser in Windows, go to an HTTPS site, and perform a sequence of actions while capturing packets with Wireshark. Then I want to use the encrypted pack

Answer 1

For browsers that use the NSS library (e.g. Firefox) you can set the SSLKEYLOGFILE environment variable, which will cause NSS to save the necessary secrets. You can then directly use that file with Wireshark. There's more information to be found here.