I currently use these settings and e.g. Privacy Possum becomes virtually unnecessary or may be replaced with EtagStoppa:It can also be used.
About: config. search, referer, by default it comes with 2. it changes to 0. and the page you visit doesn't know where you came from.
PP does block various referer headers - specifically set-cookie header, etag header, some fingerprinting, etc. . It is truly a Jack-of-all-trades. It is still useful in FF, but especially in Chromium.