Firefox Advanced Preferences

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*** Disable gzip encoding ***
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network.http.accept-encoding	- Default: gzip, deflate
network.http.accept-encoding.secure	- Default: gzip, deflate, br

Set "gzip;q=0,deflate;q=0" to DISABLE.

Ref: http://forgetmenotes.blogspot.com/2009/05/how-to-disable-gzip-compression-in.html


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*** TLS Version ***
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security.tls.version.min - Default: 3
security.tls.version.max - Default: 4

1 => TLS 1.0
2 => TLS 1.1
3 => TLS 1.2

Ref: https://support.mozilla.org/en-US/questions/1101896
Ref: http://kb.mozillazine.org/Security.tls.version.*


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*** TLS Decryption ***
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Notes:
 * Does NOT work with (EC)DHE ciphers
 * Does NOT work with TLSv1.3
 * Does NOT work with client certificates

1. Start Firefox with SSLKEYLOGFILE environment variable

	$ SSLKEYLOGFILE="$HOME/sslkey.log" /opt/firefox/firefox

2. Point to the file in Wireshark

	Edit > Preferences > Protocols > TLS > "(Pre)-Master-Secret log filename"

Ref: https://wiki.wireshark.org/TLS#tls-decryption
Ref: https://wiki.wireshark.org/TLS#using-the-pre-master-secret