There are also about:config settings that improves privacy,

//no 3p cookies

network.cookie.cookieBehavior;1

//less referer headers

network.http.referer.XOriginPolicy;2

network.http.referer.spoofSource;true

network.http.referer.trimmingPolicy;2

//etc

beacon.enabled;false

dom.event.clipboardevents.enabled;false

dom.enable_performance;false

dom.network.enabled;false

dom.battery.enabled;false

dom.vibrator.enabled;false

dom.storage.enabled;false

dom.indexedDB.enabled;false