Sometimes, when debugging websites, it can be useful to use Wireshark to observe their network traffic. The only problem with that is that it doesn’t work with encrypted traffic, of course, but also it doesn’t work with compressed traffic. Gladly, Firefox can be configured to tell website that it will not to accept compressed web pages. For this you simply need to remove/empty the “accept-encoding” HTTP header:
– Go to about:config
– search for network.http.accept-encoding
– and empty it (default is gzip, deflate)
Et voilà, Firefox will now receive web pages without GZIP compression.