Chrome not Firefox are not dumping to SSLKEYLOGFILE variable

I’m trying to decrypt SSL packages with Wireshark as described here. I have already created a SSLKEYLOGFILE System and User variable and the log file. I have restarted my computer (running Windows 10), and opened https urls with Chrome and Firefox, but none write to the ssl log file. My Chrome version is 56.0.2924.87 (64-bit) and my Firefox version is 51.0.1 (32-bit). Any idea how can I make any of the two browsers write to that file? Or is there any way to get the SSL key to be able to decrypt SSL packages in Wireshark?

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