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This made me wonder how to do it now, in Firefox 86. I found this helpful page: https://askubuntu.com/questions/797135/how-to-disable-http-r...

TL;DR about:config --> Network.http.sendRefererHeader --> change value from 2 to 0

That fully removes the header, instead of stripping it down to just the origin as they're going to be doing.

network.http.referer.defaultPolicy is the correct one